[Q] SD Bootable Unrooted Nook Image? - Nook Color General

I am sorry if this falls in the "dumb question" category, but I am wondering if anyone has created an image of the Unrooted NookColor system that could be booted up from the SD. This would allow me to attempt a boot from SD when I want the Nook to look/act like it did before rooting without the hassle of unrooting and re-rooting.

I wouldn't say dumb, but the answer is "no" though I would love it myself, as well as a bunch of others too.

This would be very handy. To run the Nook fully rooted and eventually all nookied up running all internally it would be ace to slip in an SD card and get all the deals from B&N and occasionally read a book

Jsorvik said:
I am sorry if this falls in the "dumb question" category, but I am wondering if anyone has created an image of the Unrooted NookColor system that could be booted up from the SD. This would allow me to attempt a boot from SD when I want the Nook to look/act like it did before rooting without the hassle of unrooting and re-rooting.
Click to expand...
Click to collapse
I attempted to do this some time ago, changing all instances of mmcblk0 to mmcblk1 in init.rc in the ram disk. The SD card image was unregistered (you had to go through the first start steps of putting in your B&N account) and the image on the internal flash had been started and registered.
If I remember correctly, I was able to boot and register from the SD card. However, when I removed the SD card and booted the internal flash, it acted as though I was unregistered, and there were other troubles as well. I restored it, and didn't pursue it further.
This indicates that there are other places where you need to switch from internal flash to SD card so that your internal flash doesn't get written to.
I made the backup using auto-nooter-2-12-15.img.zip where I modified the ramdisk not to actually run the auto nooter script. (you just remove it from /etc/init.d/) I could then log in via SSH and dd the internal flash to the SD card.
The idea about changing mmcblk0 to mmcblk1 was in this thread: http://forum.xda-developers.com/showthread.php?t=873243
-Mysteryvortex

Bump to the top. . . just because I am curious if anyone is still working on this. Any takers? With the ability to flash Froyo to the EMMC, it would be really nice to have a non-rooted version of the original NC that we could boot from SD when doing the B&N Reader thang. . . .

Related

[Q] Installing apps without root?

We can install nookie froyo on an SD card and run without ever rooting the nook. What I'm wondering is whether I can access the nook's internal memory from that SD-card-booted froyo in order to install apps (also without ever rooting the device)
I want to keep my nook as close to untouched as possible, but I'd like to get some apps on there as well.
Thanks!
I don't believe this is possible. The stock ROM unrooted doesn't include much. Are you just trying to get access to your purchased books? They should carry over without issue
You can access the internal memory but I'm not sure that they'll show up once booted back into stock.
froalskiner said:
I don't believe this is possible. The stock ROM unrooted doesn't include much. Are you just trying to get access to your purchased books? They should carry over without issue
Click to expand...
Click to collapse
To clarify, I'm not trying to read from my NC's internal memory but rather write to it. What I'd like to do is boot up into nookie froyo from SD card (which I can do already) and then mount the internal memory, copy over an app and set its permissions to make it executable. Then I'd remove the SD card, boot into stock ROM and execute the program (Angry Birds comes to mind)

[Q] Is my Nook Bricked beyond all hope

I was reading this thread [RECOVERY] Monster RootPack 0.7 / Clockwork Recovery 3.0.0.5 SD (1.1 Compatible!). But, since I am new to this forum I couldn't post there. I hope this is the right place to ask for help.
I upgraded my NC to 1.1.0 successfully. I put Autonooter 3.0.0 on a MicroSD card. With my NC off, I inserted the card and then plugged the NC into my PC. I got a black screen for over 5 minutes. It looked like nothing was happening, so, I disconnected the NC, removed the SD card and tired to turn the NC on. No joy, it won't turn on and won't boot at all. I think my Nook is bricked. Any ideas what went wrong?
I've read some other threads about similar problems. It seems there is a fix to get it back to stock (1.1.0). I hope the Recovery thread I mentioned above is where the answer lies. But, I'm a bit confused and don't want to make any more mistakes. I only have one 4GB SD card at my disposal right now.
My questions are as follows:
1. Is my NC bricked beyond hope of recovery?
2. If I follow the procedures in this post can I get it to boot from the sd card even though it won't turn on at all?
3. What is the difference between the Rootpack and the Clockwork Recovery Image?
4. This is the confusing part. Should I download the RootPack? Or, should I download a bootable Clockwork SD card (128mb, 1gb, 2gb, 4gb, 8gb)
5. Since I only have a 4GB card, what should I choose?
6. Should I opt for 1.0.1, or 1.1.0 where it was still working.
7. Can I get all of this on one 4GB card?
8. Is there anything else I should be weary of before starting this procedure?
If i have posted this in the wrong place, I am sorry. But, I hope someone can clear things up for me. Thanks.
This is the right place to ask general questions.
1. Most certainly not.
2. Yes, using a bootable CWR SD is the way to go.
3. Totally different. The Rootpack is the name given to a package that helps you root your Nook. CWR image is a recovery image. That means you can boot to this recovery utility and apply changes to you NC (like repairing stuff, making backups, etc.).
4. An image will adapt to the drive. If you have a 4GB SD and burn (dd) a 1GB image to it, your SD will suddenly present itself as a 1GB SD. If you format it with the right tool, your SD will be 4GB again. So don't panick, if it says 1GB after burning, it's jut "adapted to the image". You haven't lost any disk space.
5. 1GB would be enough, but you can go up to 4GB image with a 4GB.. It could sometimes be a problem to apply an image which is the exact same size as the drive. I would use th 1GB, which is plenty for what you are going to do.
6. That's up to you. Both should work.
7. Yes.
8. Just read threads exhaustively before attempting anything..
So what you need to do is read threads about this CWR Bootable img to learn how to burn it to your SD.
Then, find the appropriate .zip files to flash (apply) (1.1 recovery and 1.0.1 are available in dev section.
Copy them to root of SD.
Boot with the SD Card and apply zip files from SD.
If your NC should still have problems booting, you can also apply a boot repair zip file, that you will find on my Nook Color restore to stock tread in dev..
Sam
His Rootpack wont work on 1.1.0 You should have seen that in his instructions. It will only block 1.1.0 and fake it. You need to see this thread to fix your nook. It is 100% NOT bricked, just messed up atm. You can fix it tho. Read here:
http://forum.xda-developers.com/showthread.php?t=949699
Thanks for thr quick reponse Sam. I'm at work now, but will be able to use your suggestions later this afternoon\tonight. So, if I get a 1gb CWR image on my 4gb sd card, plus the 1.1.0 zip file and put it in the root of the sd card, the Nook should boot up even though I can't turn it on now? How long typacally will it take to boot up? What should I expect to see?
I will post results after I try the procedure. Thanks again!!
Thanks Thiboi69. I have printed out the instructions from the link you sent and will follow them to the T. I'll post results later.
It will work. I have never heard of a 100%bricked NookColor to date. And I have read 1,000's of posts here over the past 4 months. IT is just your boot partition that is messed up and B&N made it check the sdcard first for a Boot partition, then fall back to eMMC. Thank you B&N !!!
I downloaded all the files, wrote them to my sd card, and put it in the Nook. When I connected the Nook to my pc, I got a messaage the the battery was too low to turn on. So, I took the sd card out, and put the Nook on charge. After a while, it turned on, booted up and when I checked my OS, I found that I had
version 1.1.0. Apparently, my attempt to root with autonooter 3, never got installed, partially or completely. And, my battery probably got to low to turn the nook on. So, I didn't need to use CWR after all. I apologize to all who have tried to help me. But, all replies were good and contained useful info.
Now, my question is: Should I try to use Autonooter 3 again, or is there an easier
(more foolproof) way to root v1.1.0?
I just got a nook last night with the sole intention of hacking it - and did so in a matter of minutes. Autonooter couldnt be easier! When you get to the part of putting the SD card in the nook and connecting it to USB to make it boot, just plug it in and go get a cup of coffee. Don't unplug or touch anything until it boots up by itself. At 1st I thought it wasn't doing anything as I didn't see a clockwork mod screen come up or anything, but just be patient and it'll tell you when it's done. Just make sure it's pretty well charged when you do it - mine was about 80% or so.
Honestly after less than a day of the rooted stock 2.1 Eclair OS, I'm ready to drop a fully customized Froyo or Gingerbread image on this thing. Autonooter it 1st and run it for a few days 1st and see what you think. I'm still learning the ins and outs of tinkering with this thing, but so far it seems much easier than the Epic and Moment I've been beating on. Seems pretty well unbrickable too thanks to the boot to SD 1st option B&N baked into this puppy.
jostarr said:
I was reading this thread [RECOVERY] Monster RootPack 0.7 / Clockwork Recovery 3.0.0.5 SD (1.1 Compatible!). But, since I am new to this forum I couldn't post there. I hope this is the right place to ask for help.
I upgraded my NC to 1.1.0 successfully. I put Autonooter 3.0.0 on a MicroSD card. With my NC off, I inserted the card and then plugged the NC into my PC. I got a black screen for over 5 minutes. It looked like nothing was happening, so, I disconnected the NC, removed the SD card and tired to turn the NC on. No joy, it won't turn on and won't boot at all. I think my Nook is bricked. Any ideas what went wrong?
I've read some other threads about similar problems. It seems there is a fix to get it back to stock (1.1.0). I hope the Recovery thread I mentioned above is where the answer lies. But, I'm a bit confused and don't want to make any more mistakes. I only have one 4GB SD card at my disposal right now.
My questions are as follows:
1. Is my NC bricked beyond hope of recovery?
2. If I follow the procedures in this post can I get it to boot from the sd card even though it won't turn on at all?
3. What is the difference between the Rootpack and the Clockwork Recovery Image?
4. This is the confusing part. Should I download the RootPack? Or, should I download a bootable Clockwork SD card (128mb, 1gb, 2gb, 4gb, 8gb)
5. Since I only have a 4GB card, what should I choose?
6. Should I opt for 1.0.1, or 1.1.0 where it was still working.
7. Can I get all of this on one 4GB card?
8. Is there anything else I should be weary of before starting this procedure?
If i have posted this in the wrong place, I am sorry. But, I hope someone can clear things up for me. Thanks.
Click to expand...
Click to collapse
Joe, I would recommend downloading the 1gb rootpack image and a restore to stock file. Make your bootable clockwork recovery image, place the resotre to stock file on the sdcard, turn your nook off, insert the sdcard, power on and flash the file. All this info and more can be found in my thread here:
http://forum.xda-developers.com/showthread.php?t=949699
Thanks for your suggestion Riley, please take a look at my post # 7 above. Seemd my NC
had a low battery. When I charged it, all was ok. It booted up and I was back in 1.1.0.
But, I just now tried autonooter 3.0.0 again. When I pluged thr NC inyo my PC, I got some sort or warning message. I hit cancel and waited a few minutes. The message came up again. It said the device was not recognized. I unplugged, removed the card, and my fully charged NV won't turn on. And, windows explorer can not read the sd card. This is basically what happened yesterday to cause my panic. The sd card had all the files befor I inserted it into the NC. Now, it's unreadable and I can't turn on or boot the NC again.
Is it autonooter 3.0.0, or the card, or the Nook, or me?????
One correction to post # 10. I can read the sd card in windows explorer. But my NC won't turn on.
With sd card out of the Nook, I get a "Welcome to the Found New Hardware Wizzard"
What does this tell anyone about the condition of my Nook?
I am having a problem and don't really know what to do. When I start my NC its stops at the N screen and goes no further. I've tried a lot of the different ways to get it back to stock with no luck. When I try to write CWM to my SD card with win32 it either doesn't have enough room to put the stock file on the zip with it or when I open the SD card it says the card needs to be formatted. The file is a tr.gz or something like that is there a step between that I am missing or just download the CWM and write to SD using win32? I also tried adb with no luck. I am very new to rooting so any super dumbed down instructions would be greatly appreciated.
Sent from my ADR6300 using XDA App
You can put the rom image to a separate SD card. Just swap it after you boot up from cwr. I did it before for flashing froyo to emmc.
Sent from my PC36100 using XDA App
72chevy2k2 said:
I am having a problem and don't really know what to do. When I start my NC its stops at the N screen and goes no further. I've tried a lot of the different ways to get it back to stock with no luck. When I try to write CWM to my SD card with win32 it either doesn't have enough room to put the stock file on the zip with it or when I open the SD card it says the card needs to be formatted. The file is a tr.gz or something like that is there a step between that I am missing or just download the CWM and write to SD using win32? I also tried adb with no luck. I am very new to rooting so any super dumbed down instructions would be greatly appreciated.
Click to expand...
Click to collapse
Have you followed the restore-to-stock procedure outlined in this thread?
http://forum.xda-developers.com/showthread.php?t=914690
Just a noobish advise!
After configure everything and become accustomed to some of the NC behaviors this should not matter, but I remember at my first attempts at rooting the NC, using a Win7 PC was much easier than using Win XP or iOS devices. Might fix your 'not recognized' problems, sd card recognition and formatting problems etc.
It has CWM on it. I can get it to recovery but it will not recognize the SD or not mount it and I go to mount it in the menu and it says something like can not mount SD card so I have been trying to do the CWM SD burn but I keep getting the above errors I am on a vista computer so I will try it on my windows 7 one and see how that goes. And the different SD card one I will try that as well after work thank you for the help.
Sent from my ADR6300 using XDA App
RickOSidhe said:
Have you followed the restore-to-stock procedure outlined in this thread?
http://forum.xda-developers.com/showthread.php?t=914690
Click to expand...
Click to collapse
Yes I did try that one I put the nookie froyo on the SD and put it I'm my turned off NC and plugged it in to my computer and it sat at the N screen forever and after a while I took it off and it was still in the same state could the CWM be the problem?
Sent from my ADR6300 using XDA App
I'm not sure what posts 13 thru 18 have to do with my problem???
Just didn't feel like starting a new thread for the couple of questions I had along the same line as yours.
Sent from my ADR6300 using XDA App

[Q] Nook Stuck on Boot Skater Screen with CM7 uSD

Seminoobie, please help. I successfully made a Nook CM7 uSD with the Size-Agnostic instructions using 7.0.2 (thanks dev). Transcend 8gb card. Worked great for three days, now it is stuck on the circle-skater screen. I let it run for a half-hour, no dice.
Running Autnootered 3.0 emmc in 1.1, that works fine. I don't have CWM installed on emmc (I want to avoid this for now to make factory restore/1.2 upgrade easier for autonooter 4), so I have no current access to Rom Manager, if that matters. I've seen some posts suggesting to clear caches with Rom Manager but I assume the uSD caches aren't in internal memory, are they? Other posts suggest partition corruption but the card worked fine before I turned it off and rebooted, and the boot partion shows up on the computer with a card reader just as you would expect.
The last thing I did before this happened was run Titanium Backup to pull the 200 existing apps on emmc onto the CM7 card. I did this by copying the entire full Backup file from a standard sd backup to the computer, then copied that file back to the /sd partition after putting cm7 into usb mode, then running Titanium in CM7. That worked fine, and I even was able to move some of the apps to the virtual SD and they worked.
I could take an hour and burn another card but wondered if I am just missing something to fix this, also if I do burn another card whether I did something wrong in applying Titanium that I should avoid again.
Also wondering if it is worth waiting for a future stable build that addresses the Nook deep sleep/battery drain issue, which seems to be in the works.
If I burn another card and get the same freeze happiness will elude me. Thanks in advance.
I assume you powered down and rebooted. I have had that happen to me and after a fresh reboot everything loaded.

need help, nook is all messed up--solved

I use the SD card method to have the nook boot into CM7 and when the SD card is pulled, the nook would be stock to be used by my kids. But I think I messed things up and can't restore. Here is what I have done:
1- I tried to update the stock version to 1.3 manually from B&N website but soon realized I could not. It seems like when in CM7, I had tried to flash CWM recovery (which was not needed and is pretty buggy in SD card method for nook). Now the recovery in emmc appears to be CWM.
2-for some stupid reason when I got into CMM recovery, I formatted boot, system,data and cache (not sure if I did boot also or not). My thinking was to flash a stock image and be fixed. But I am now stuck.
Is there a way to go back to stock on the nook? I am still able to boot into SD card and CM7 nightly. Oh ya, I use Linux Ubuntu not windows. TIA
Sounds like you should get the system back to stock before proceeding any further.
Follow the instruction here: http://www.nookdevs.com/NookColor_UnRooting
The problem is that I get into the CWM recovery and not given the reset option following the options on that page. Any idea?
I think my problem is that I'm not really rooted in true sense since I was running off the SD card. Maybe I shoudl root properly, then unroot?
I did kind of the same thing once. I made an Sd card image with CWM on another sd card -- basically as if you are going to install CM7 to emmc. However, once you get to the point where you would flash Cm7, use the stock zip ROM. It will install that to emmc so it will be back to normal. You should then be good to go.
loveubuntu said:
The problem is that I get into the CWM recovery and not given the reset option following the options on that page. Any idea?
I think my problem is that I'm not really rooted in true sense since I was running off the SD card. Maybe I shoudl root properly, then unroot?
Click to expand...
Click to collapse
If you follow the instructions you should be left with an unrooted initialized stock Nook Color. Register your account. Then you can wait for the NC to download the 1.3 update, or side load it. Once that is installed you have an unrooted 1.3 stock system.
From there you can try your CM7 card. Don't forget to remove your SD card at the very beginning since like a PC the NC will try to boot off the SD card if it is present.
jerrykur said:
If you follow the instructions you should be left with an unrooted initialized stock Nook Color. Register your account. Then you can wait for the NC to download the 1.3 update, or side load it. Once that is installed you have an unrooted 1.3 stock system.
From there you can try your CM7 card. Don't forget to remove your SD card at the very beginning since like a PC the NC will try to boot off the SD card if it is present.
Click to expand...
Click to collapse
when I follow the instruction, I am not given the factory reset option. I am stuck at the n screen. It flashed the read forever but then stuck at the n screen. Do I have to wait longer than 5 minutes?
None of this is mine, I owe it ALL to the threads mentioned below.
So as in many posts on XDA say, it's almost impossible to brick the Nook. What a great device. I had to format my SD card to use it to "un-brick" my nook but it was done. I Mainly used the info here http://forum.xda-developers.com/showthread.php?t=949699
Burnt a bootable CWM image onto my SD card. It took a while doing it with dd in Linux. I'm sure it's the same in Windows or Mac. It took about 20-30 minutes. It also took a while to unzip/extract the img file from the downloaded file. Be patient
Then used the CWM recovery remover file from http://forum.xda-developers.com/showthread.php?t=914690 to remove my CWM recovery and used the 1.0.1 file from same thread to flash the stock image onto the nook.
Once the SD card is ready, just drop those files in the root of the sd card. It should have 4 other files in it to boot into CWM recovery from the sd card and let you use the menus to flash those two zip files. It took a while but it's all in those threads. Thanks to the members. Now lets see if I can go up to 1.3 and then root it again.
you also need to do this
http://forum.xda-developers.com/showthread.php?t=1094371
and here is the ver 1.2 stock flashable with an clockwork bootable sd card
http://forum.xda-developers.com/showthread.php?t=1050520

Help, several NOOB questions

THANK YOU IN ADVANCE FOR ANY HELP! I'm dead new with android and just got a Nook HD+ 32gb (groupon deal $130)
anyway, I've done a ton of reading on here and watched a bunch of youtube vids- i don't know if people use overlapping terminology that means the same things or what.. and also seems like theres a lot of opinions in the forums.
I want basically the full android experience and root access- like i said, never used any android, but i like toying around with these things. BUT i also really want a fully stable platform- don't want constant crashing or it reseting on me.
questions i have-
1)the CWM is the "program" (don't know the correct terminology) that basically gives me the access to back up and install new roms, root, etc? TWRP does the same thing- but i understand you don't use that?
2)If i have a BRAND NEW nook HD+ do i need to back it up before messing with it OR are the "stock rom" zips you provided just that?
2) with the SD card image, do i need to put a specific image on the specified sd card. i.e. 4gb SD gets a 4gb image? or is the image universal to whatever size SD card i get?
2a) What problems am i going to run into using my mac to make the SD card, if any? what program do i need to use?
4) when you back up through CWM where does it save it? to the SD card?
4a) this is where i was confused about the image, reading into some of the posts it led me to think the image file took up the entirety of the
SD card.
4b)So in the future i could just boot from the SD card and would have the option to flash the stock rom back on the HD+ if desired? and/or
go back to CM?
5) what is DUALBOOTING? and NANDROID? how do they tie into CWM and CM10. very confused about this.
6) any disadvantage to flashing the EMMC vs booting from SD card every time? I THINK i want to flash the emmc, i don't want to be tied to booting from the SD card everytime- if I'm understanding that correctly.
7)what is this "trim" lag problem? couldn't really figure out what people were talking about.
thanks a ton for any help you can give me- I'm sure you receive a lot of questions!
-Sonny
santinod15 said:
THANK YOU IN ADVANCE FOR ANY HELP! I'm dead new with android and just got a Nook HD+ 32gb (groupon deal $130)
anyway, I've done a ton of reading on here and watched a bunch of youtube vids- i don't know if people use overlapping terminology that means the same things or what.. and also seems like theres a lot of opinions in the forums.
I want basically the full android experience and root access- like i said, never used any android, but i like toying around with these things. BUT i also really want a fully stable platform- don't want constant crashing or it reseting on me.
questions i have-
1)the CWM is the "program" (don't know the correct terminology) that basically gives me the access to back up and install new roms, root, etc? TWRP does the same thing- but i understand you don't use that?
Click to expand...
Click to collapse
CWM (ClockworkMod) is a recovery program that allows you to do just what you said. TWRP is also a recovery, but uses the touch screen instead of hardware keys to control it.
2)If i have a BRAND NEW nook HD+ do i need to back it up before messing with it OR are the "stock rom" zips you provided just that?
Click to expand...
Click to collapse
You can either use the CWM backup tool to return your device to stock (including any data you have already created, like registration) or the plain stock zips I have will also return you to stock, but the way it was when you got it new before registering.
3) with the SD card image, do i need to put a specific image on the specified sd card. i.e. 4gb SD gets a 4gb image? or is the image universal to whatever size SD card i get?
3a) What problems am i going to run into using my mac to make the SD card, if any? what program do i need to use?
Click to expand...
Click to collapse
Since you have a Mac, the best way to do it is the new procedure without burning an image. Since I don't have a Mac, I don't know the exact programs to use. I think SDFormatter comes in a Mac version. And I know there are lots of mac partitioning programs to set the first partition active. And using the procedure does use all of the SD, so it is best to use a relatively small one, 2-4GB.
4) when you back up through CWM where does it save it? to the SD card?
4a) this is where i was confused about the image, reading into some of the posts it led me to think the image file took up the entirety of the
SD card.
4b)So in the future i could just boot from the SD card and would have the option to flash the stock rom back on the HD+ if desired? and/or
go back to CM?
Click to expand...
Click to collapse
It saves it either to the SD card or internal memory, you choose.
Yes it uses all of the SD if you use the new procedure. But you need that if you choose to backup to SD. A backup takes about 1.5GB.
And yes, save the SD for future use, like restoring backups or installing new ROMs.
5) what is DUALBOOTING? and NANDROID? how do they tie into CWM and CM10. very confused about this.
Click to expand...
Click to collapse
Dual booting means having one operating system on internal memory (also called emmc for Embedded MultiMedia Card) and one installed to a bootable SD. Most people that dual boot have stock on internal and CM on SD. They are separate and independent from each other.
Nandroid just means internal memory. So a nandroid backup means backing up whatever you have on internal memory.
6) any disadvantage to flashing the EMMC vs booting from SD card every time? I THINK i want to flash the emmc, i don't want to be tied to booting from the SD card everytime- if I'm understanding that correctly.
Click to expand...
Click to collapse
The only advantage to booting to CM on SD is it leaves internal memory untouched for warranty reasons. The disadvantage is it runs slower and is less stable.
7)what is this "trim" lag problem? couldn't really figure out what people were talking about.
Click to expand...
Click to collapse
LAG is a complex issue to explain. If you are used to hard drives getting fragmented and slowing down your system, LAG is similar but a different mechanism with solid state flash drives. TRIM is a process to undo what causes LAG. But some of the solid state chips in these devices have a bug and when TRIM is run, it bricks the chip, making it unusable.
thanks a ton for any help you can give me- I'm sure you receive a lot of questions!
-Sonny
Click to expand...
Click to collapse
leapinlar said:
CWM (ClockworkMod) is a recovery program that allows you to do just what you said. TWRP is also a recovery, but uses the touch screen instead of hardware keys to control it.
You can either use the CWM backup tool to return your device to stock (including any data you have already created, like registration) or the plain stock zips I have will also return you to stock, but the way it was when you got it new before registering.
Since you have a Mac, the best way to do it is the new procedure without burning an image. Since I don't have a Mac, I don't know the exact programs to use. I think SDFormatter comes in a Mac version. And I know there are lots of mac partitioning programs to set the first partition active. And using the procedure does use all of the SD, so it is best to use a relatively small one, 2-4GB.
It saves it either to the SD card or internal memory, you choose.
Yes it uses all of the SD if you use the new procedure. But you need that if you choose to backup to SD. A backup takes about 1.5GB.
And yes, save the SD for future use, like restoring backups or installing new ROMs.
Dual booting means having one operating system on internal memory (also called emmc for Embedded MultiMedia Card) and one installed to a bootable SD. Most people that dual boot have stock on internal and CM on SD. They are separate and independent from each other.
Nandroid just means internal memory. So a nandroid backup means backing up whatever you have on internal memory.
The only advantage to booting to CM on SD is it leaves internal memory untouched for warranty reasons. The disadvantage is it runs slower and is less stable.
LAG is a complex issue to explain. If you are used to hard drives getting fragmented and slowing down your system, LAG is similar but a different mechanism with solid state flash drives. TRIM is a process to undo what causes LAG. But some of the solid state chips in these devices have a bug and when TRIM is run, it bricks the chip, making it unusable.
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THANK YOU.. so much answered for me

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