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Differences between booting from uSD and emmc?

Hey everyone,
I currently run CM7 off an SD but I was wondering if there are benefits to replacing the stock os on the emmc?
Are there any speed differences or technical pros to it?
Thanks for the input! This is a really fantastic forum!
sent from my nook color

joelszs said:
Hey everyone,
I currently run CM7 off an SD but I was wondering if there are benefits to replacing the stock os on the emmc?
Are there any speed differences or technical pros to it?
Thanks for the input! This is a really fantastic forum!
sent from my nook color
Click to expand...
Click to collapse
From my experience the booting time is almost half if using emmc version. (SD card version ran on a class 4 card). After booting the performance is almost same. You may get better boot time for sd card using a class 6 or class 10 card.

I dont have an answer for you as i picked mine up yesterday and decided to go the SD route at the start i am curious on this question myself.

JustusIV said:
I dont have an answer for you as i picked mine up yesterday and decided to go the SD route at the start i am curious on this question myself.
Click to expand...
Click to collapse
Well from my experience, running from the SD card is very smooth... so for ease of use i highly recommend it for a first go.
I have a follow up question- for some reason my macbook recognizes the second partition of my sd card but my pc desktop does not. I am referring to the partition generated for storage by the CM7 installation process that allows storage on the data card simultaneously.
Any ideas why this would be?
sent from my nook color

joelszs said:
Well from my experience, running from the SD card is very smooth... so for ease of use i highly recommend it for a first go.
I have a follow up question- for some reason my macbook recognizes the second partition of my sd card but my pc desktop does not. I am referring to the partition generated for storage by the CM7 installation process that allows storage on the data card simultaneously.
Any ideas why this would be?
sent from my nook color
Click to expand...
Click to collapse
I use Macs and Windows machines rarely (and I am guessing you run Windows on the desktop) but my guess is the ext4 partitioning that CM7 uses.
I seem to recall that working- at least somewhat- on Mac but not on Windows, but I am not positive.

i chose sd, because it's super easy to backup my sd card as an image by popping it into my laptop. I can then burn that image back to a sd card if i want to try a new android build without messing up my default android install. I can always boot into the original nook os if i want as it is unmodified.
i used a class 2 and it was pretty slow. moving up to a class 6 and 10 has really helped and i don't notice any slowness.
i have not run off internal memory though so i don't have a baseline to compare.

eMMC is faster than my class 2 uSD cards, and it's easier to swa stuff back and forth from a computer/phone/camera/whatever with a removable uSD.
Sent from my Froyo'd Epic using XDA App

Cool, I've been wondering about this myself and was about to make this same thread.
I was concerned because I get a ton of force closes running off the SD, and I wondered if that was a problem that would be solved by going to eemc. Or if somehow I've made a mistake setting up my card and that's the issue. I'm very knew to this whole scene, so I'm still a bit scared of rooting at the moment and would love to iron out the problems I'm having with the SD booting. Things run fast, and fairly smoothly but eventually something will force close, like Market, and then Google Frameworks and then pretty much everything will refuse to run after I tap their icon. Forcing me to restart. Also, some things, trying to download new skins for Beautiful Widgets is impossible. Only get force closes.
I can't figure out if it's anything in particular that causes it to spiral out of control. And what makes it more annoying is this is my girlfriend's new Nook, I'm trying to get it set up for her to work as smoothly as possible. If it was just mine, I wouldn't be as bothered by messing around and trying different configurations and whatnot. But I know she won't be as patient and tolerant of these issues and won't want to keep bugging me with every problem that pops up.
Would you say this is likely a localized problem on my end through some fault of my own? From this thread, it seems people are having pretty great experiences with the SD method. Which might be reassuring. I think I'll do a backup and start from scratch this evening.

@JRSly: What type of uSD card are you using. I was experiencing the same problems you had with booting, force close, refuse to run, thus a final restart. After swapping out four different types of uSD cards, SanDisk (class 2 and 4), A-DATA (class 6), Patriot (class10), I finally deteremined that the Nook is very picky about the type of card. All the cards work fine in my digital camera or PCs, but the A-DATA and Patriot are slow and often hang in the Nook. I am now using the three Sandisk cards with no problem. I recently updated to Nookie Froyo 6.8.5 and it runs great on the SanDisk cards. Just for the test if it will run faster on A-Data (class 6), wouldn't you know it starts to hang and FC just like before. I guess I'll use the A-Data card in my digicam. Try a Sandisk card and see what happens. I even try one of my old Sandisk 2GB card from my Blackberry which is unmarked but has a class 10 performance when measured.

I'm very new to this... and I keep seeing emmc.
What is this? Internal memory?

ax135 said:
@JRSly: What type of uSD card are you using. I was experiencing the same problems you had with booting, force close, refuse to run, thus a final restart. After swapping out four different types of uSD cards, SanDisk (class 2 and 4), A-DATA (class 6), Patriot (class10), I finally deteremined that the Nook is very picky about the type of card. All the cards work fine in my digital camera or PCs, but the A-DATA and Patriot are slow and often hang in the Nook. I am now using the three Sandisk cards with no problem. I recently updated to Nookie Froyo 6.8.5 and it runs great on the SanDisk cards. Just for the test if it will run faster on A-Data (class 6), wouldn't you know it starts to hang and FC just like before. I guess I'll use the A-Data card in my digicam. Try a Sandisk card and see what happens. I even try one of my old Sandisk 2GB card from my Blackberry which is unmarked but has a class 10 performance when measured.
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Click to collapse
I feared that this might be a possibility too. My first attempts were with a little 2Gb card I'd had lying around and it didn't work very well at all. I couldn't get past installing Gapps for all the force closes. The next day I went to Target to get a larger 8 Gb one so I could also play around with Honeycomb, it's a Class 6 Lexar card. I started over last night and tried a couple of attempts at wiping and burning the image and inevitably ran into the same problems. It looks like a crummy(at least in terms of what the Nook likes) card is a distinct possibility. I'll give Sandisk a shot.

BlizzofOZ said:
I'm very new to this... and I keep seeing emmc.
What is this? Internal memory?
Click to expand...
Click to collapse
Yup. (I didn't get it either.)
Since MMC is a sibling of SD cards, it's basically dedicated internal SD storage with a controller.
http://en.wikipedia.org/wiki/MultiMediaCard#eMMC

BlizzofOZ said:
I'm very new to this... and I keep seeing emmc.
What is this? Internal memory?
Click to expand...
Click to collapse
You got it in one.
sd card is self explanatory, of course, and emmc is the internal memory of the NC.
The only DISADVANTAGE to running on emmc is that you lose the stock B&N version of Android.
Other than that- it boots a bit faster, may run a bit faster and be less likely to have force closes and similar problems.

xdabr said:
Yup. (I didn't get it either.)
Since MMC is a sibling of SD cards, it's basically dedicated internal SD storage with a controller.
http://en.wikipedia.org/wiki/MultiMediaCard#eMMC
Click to expand...
Click to collapse
That's what I thought!
Thanks for the cofirmation

[Q] CM7 eMMC SD Card Corruption

Hi there! I've been using CM7 for a while now and have had three or four occasions so far where my 16 Gig Patriot Class 10 card has ended up with either partially or completely corrupted data and I'm curious if this is just an issue with a cheap card, some feature of the Nook or related to something in CM7. Most of the time it will eventually come up with a damaged SD card warning but prior to that my directory structure gets mutated into symbols instead of letters (it's current state).
I'm planning on swapping out the card with a SanDisk I have here so if it's the card I suspect the problem will go away but mostly I was wondering:
1. Anyone else have this issue?
2. Are there any known fixes?
Appreciate any help. Would eventually like to be able to use this card for storing movies but having it fritz out from time to time is a real pain with the amount of stuff android keeps on the SD cards.

[Q] [HD+] Which types of SD cards are best for my situation

Hi all, a few questions here if you don't mind. I'm a recent owner of a HD+ and have had a great time with it but I am ready to get CM on it now. At first I wanted to dual-boot using either Hybrid or Pure but now I think I'm going to just to EMMC.
I have a lot of comics I want to store, if I'm using EMMC is there no problem using a 64gb class 10 card? From what I've read it seems that class 10 cards only cause problems if you are booting from the SD card?
If I do go hybrid or pure, it is better to use a class 4 (32gb max?) card for this correct?
I do think that I am just going to go the EMMC route, does doing this erase everything already on the Nook or just the OS? (I need to remove any other media myself?)
Thanks a lot for reading all that, and any help is much appreciated!

Installing CM into EMMC will erase every userdata and OS on it.
As long as you want to just store files on it, you can go and get the 64GB one.
My experience with those classes are that, that Class 10 is only fast for big continously written files like videos or songs in high quality.
Lower classes or non classified ones are often MUCH faster at tiny to medium sized files with much access on different adresses.
Backup everything, do a backup via SD recovery, then make factory reset via SD recovery and install CM10.1 plus GApps.
I am a HD+ owner since today and I have chosen to go directly to CM10.1 stable emmc, because I already had experience with SD ROMs from my old HTC HD2 (RIP) and I hated the lags and everything...
(I hate every vendor made bloatware that is stacked onto Android...)
The only thing I can say after my first day with vanilla CM10.1 is, THIS TABLET+PRICE+CM10.1 = AWESOME :laugh:

Hello,
I hope you're well, and I hope you're enjoying your Nook. Installing CyanogenMod on the Nook was the best thing I ever did (at the time Stock didn't have Google Play), so I hope you too enjoy CM.
Personally I do believe that installing CM10.1.3 (stable) on EMMC for general usage is the best way to go. I'd avoid CM10.2 for now, until a RC or stable version is released.
If you're running CyanogenMod (CM) on EMMC, there should be no problems at all as regards to what SD card you use. The storage size or class should not matter when on EMMC; although higher class is tied with better performance. The whole best SD card to use is 4GB class 4 arose when we didn't have the EMMC method of installation; back then we used to boot/install the whole CM on the SD card. Now, I don't think your SD card is as important - anything is a go, after all you're using it for storage only.
If you do go Hybrid or Pure, yes a class 4 SanDisk SD card is best. 4GB is also recommended, but you can go higher if you desire. If you do install on SD card, I'd recommend going Hybrid and not Pure. Out of the two, I'd just go EMMC (EMMC > Hybrid > Pure). However, if you do install on EMMC, everything will be erased on your internal; this includes your stock ROM, and all data/apps. You will however have all your B&N books saved on the B&N cloud.
All the best, any more questions please feel free to ask.
Jann F said:
THIS TABLET+PRICE+CM10.1 = AWESOME :laugh:
Click to expand...
Click to collapse
I back this statement.

Thanks for your replies guys!
You pretty much cleared up any confusion/questions I had regarding this. Pretty sure I'm going to just do EMMC. Plus even with the GooglePlay on the Nook now, I still have a lot of games that aren't compatible or are from Humble Bundles, so I don't think I'll have much use for stock.
One more question and I'll leave you guys alone. I have a USB MicroSD card reader I got somewhere years ago. Am I to assume the newer microsdcards won't work with this? I'll have to keep an eye out for a good deal on both. Thanksfully black friday is only a month away in the US :laugh:

elektrokuter said:
I have a USB MicroSD card reader I got somewhere years ago. Am I to assume the newer microsdcards won't work with this?
Click to expand...
Click to collapse
Haha, no problem at all! We're glad we could help.
Regarding your MicroSD card reader; it shouldn't be a problem, as SD cards haven't changed over the years - only the storage capacity. As long as your card reader can read MicroSD cards, and can write to them, you should be good to go. Of course however, I don't know what card reader you have, so there could be problems. I'm assuming it should be safe though.
All the best.

HiddenG said:
Regarding your MicroSD card reader; it shouldn't be a problem, as SD cards haven't changed over the years - only the storage capacity. As long as your card reader can read MicroSD cards, and can write to them, you should be good to go. Of course however, I don't know what card reader you have, so there could be problems. I'm assuming it should be safe though.
Click to expand...
Click to collapse
Nope, SD-Card Readers aren't compatible with SDHC/SDXC Cards as there are some differences.
SDHC-Cardreaders are compatible with every type.
SD-Reader --> SD -/-> SDHC/XC
SDHC/XC-Reader --> SD --> SDHC/XC
SD-Card = <4GB
SDHC-Card = >=4GB to 32GB
SDXC-Card = >=64GB to 2TB

Jann F said:
Nope, SD-Card Readers aren't compatible with SDHC/SDXC Cards as there are some differences.
SDHC-Cardreaders are compatible with every type.
SD-Reader --> SD -/-> SDHC/XC
SDHC/XC-Reader --> SD --> SDHC/XC
SD-Card = <4GB
SDHC-Card = >=4GB to 32GB
SDXC-Card = >=64GB to 2TB
Click to expand...
Click to collapse
Thanks for the info! This is the specs of the card reader I have
"Versatile — 9-in-1 USB card reader that works with SD, SDHC, MMC, MMCplus, MMCmobile, RS-MMC, microSD, and miniSD, MMCmicro"
Seeing as it lists the SD and mircosd compatibilities separate, am I right to assume it cannot read the micro sdxc cards I am going to need?

elektrokuter said:
Thanks for the info! This is the specs of the card reader I have
"Versatile — 9-in-1 USB card reader that works with SD, SDHC, MMC, MMCplus, MMCmobile, RS-MMC, microSD, and miniSD, MMCmicro"
Seeing as it lists the SD and mircosd compatibilities separate, am I right to assume it cannot read the micro sdxc cards I am going to need?
Click to expand...
Click to collapse
As it supports SDHC, your reader should be good to go with microSDHC cards.

[Q] Xperia V SD card sudden unmount after 4.3 update

Even though there are a lot of people out there with the same problem, I cant see a viable fix other than to re-format the card?
My question is, why after the update? It ran fine in the same phone when I was running 4.1.2
I saw in a post that making a file named .nomedia in the sdcard will prevent the media check. Will this prevent apps like movies and photos from finding out new files as well?
For whats worth my sd card is 16GB and is a Transcend C6

I have the same problem on my Xperia TX since 4.3 upgrade.
I read a post on the official sony support page, and they recommend reformat the sd to exFAT format, but after doing that the problem persists...
Any clue?

Take the SD card out, and check it's filesystem with a PC.
Also, make sure that the card is well inserted in the slot, because the V has a rather loose socket for the SIM and SD, and you may have bad contact on it.
Many users got this due to bad "sectors" in the SD, which is a common problem due to the technology being used (it doesn't like too many re-writes in the same memory region).
Sometimes, the only fix is to get another SD...
Good luck, mate.

Thanks for your reply.
When the phone detects the card it sees as 16gb (actually 14GB), but when I check it on my pc it says that it's a 30MB card.
The card worked fine until the 4.3 android upgrade.
I think it's dead....

No, try to format using your pc, but use another filesystem , than reformat into your phone
Inviato dal mio LG-V500 utilizzando Tapatalk

After trying in several OS and phones my final conclusion it's that the 4.3 upgrade fried my 16GB sd card...
It was working flawlessly on my old Blackberry 9930 for almost a year an then on my TX since July 2013 until I updated my phone to 4.3 in february.
At the official Sony support forum there are many complains about this issue and the official Sony Statement it's something like: "**** happens", they don't care about the money you spend replacing your SD nor your data.
I think we should raise our voices and get a better solution for this problem...

Actually the card may have fried due to too many overwrites in the same memory region.
It's a problem of the SD technology. Actually it could also happen on a cheap SSD drive if it's firmware doesn't do realtime remapping.
And SD cards are even more prone to this...
Don't blame on the OS upgrade, because it could happen anytime if massive rewrites are performed.
If you check Samsung's and other forums, they also have their fair part of similar issues.

I know that it maybe caused by errors on the technology, but it's a big coincidence that after updating the os from 4.1.2 to 4.3 the card start to fail, go to the Sony support forum and you will see a lot of complains on Z, V, T, TX, S models after the upgrade.
My sd isn't a cheap model, it cost to my $30 when I bought it 2 years ago, Sandisk 16GB Class 4 SDHC.
I think it's something related to the SD support on the 4.3

Issue with an SD Card

Heya guys,
long story short: I started getting some random SD card ejects after one of the updates. Sadly, I can't pinpoint the specific nightly.
The MicroSD card went through extensive tests,reformats and checks. Tried using it in both adaptive and portable storage modes but still getting the problem. The MicroSD card appears to be genuine, its 32 gigs and currently it works. It's formatted in ExFat I believe and it usually starts ejecting during the playback of songs.
I got an unsupported SD format once, but after a reboot it seems to be working again.
After some forum reading I saw that people say that their cards are usually dying and they just need to change it.
One thing I suspect that shorthened the life of my card was actually dual-booting with MultiRom. Im aware that cards have a specific write/read count, but I was a bit hopeful that I wouldnt need to change my card.
I'd like to ask if someone else has experienced the same issues and found a solution, or I really just need to get a new MicroSD card.
Thank you in Advance.