Database Develop

[help:] MMC vs SD

Hi everyone,
I'm confused which card is more compatible for O2 XDA IIi (Alpine) apart from the brand ?
is it:
SD
or
MMC / MMC+ / MMC Dual Voltage ?
Thanks

AFAIK both SD and MMC card works for the xda2i?alpine.though you have to buy a card with a fast write/read speed.

As far as I know (bar the voltages) the only difference between SD & MMC is that the MMC card does not have a 'write protect' sliding tab, whereas the SD cards do.
Joe Pinball
P.S. first post!
P.P.S. still waiting to get my Alpine!

Here is the data I've found from Kingston website:
<h3>SD</h3>
Secure Digital, introduced in late 2001, is a second-generation and more popular
derivative of the MultiMediaCard (MMC) standard (see section 7.4) that is backwardcompatible
with current MMC cards.
The Secure Digital format includes several important technological advancements over
MMC. These include the addition of cryptographic security protection for copyrighted
data/music and a 4X increase in data transfer rates. The SD Card Association sets the
specifications for Secure Digital cards.
To help support higher-capacity cards, SD cards are slightly thicker than the original
MMC cards. This means that devices designed to support SD cards may also accept
MMC cards (if the host device is not strictly limited to SD media for data security
reasons). However, devices exclusively designed for MMC cards will not support the
thicker SD cards at this time.
<h3>MMC</h3>
MultiMediaCards are one of the smallest Flash cards available, about the size of a
postage stamp. They were introduced in 1997 and initially used in the mobile phone
and pager markets. Today, they are commonly used in digital cameras, mobile phones,
and MP3 players. The MultiMediaCard Association sets the specifications for MMC.
Finally, the best option would be the SD card for the Expansion based on the speed.
thanks mate.

SD is MMC with data encryption (hence Secure Digital). Supposed to stop unauthorised copying, etc - but I don't think it's a defaulted feature, how else would you be able to read your own data when you swap cards between devices
SD has a much faster read/write rate than MMC, although the latest generation of MMC cards are faster than SD. However, they're also more expensive, and I'm not sure if they're full compatible with existing SD equipment (although MMC and SD are cross-compatible, so who knows... If you want to buy an MMC+ card and trial it, fine by me ).
Based purely on a weigh-up of cost vs. speed, SD is the more viable option at the moment.

According to the Kingston website, the MMC+ cards will work with the I-Mate PDA2.
It also states that the max size for any card is 1GB though???????
Who wants to put them straight?

wooww thank you very much indeed my friends.
now i really understand the difference.
this forum is ROCKZZZ !!!

Storage Card Woes(A Public Service Announcement)

People have been reporting problems with corruption and losing files on memory cards, particularly 2GB ones.
I am having the same problem with a PQI 2GB bought from Fry's(PLU# 5044075 and P/N: AE62-2030R01F4) in Houston, TX.
When I try to download something from an FTP Client to the storage card, it fails and when I leave stuff on it, it becomes corrupt and stuff disappears. Also, when transferring files over FTP, it moves at about 5-8 KBps.
I took my roommate's 64MB PQI from his Sidekick III and it worked like a charm. It was as follows.
1 Head
1 Cylinder
Type: FAT12
Sector: 512 Bytes
Cluster Size: 16 KB
BackupFAT: Yes
I used Pocket Mechanic(amazing interface) and Resco which is great and clean as well! Thank you for the recommendation. I scanned my card for bad sectors and they were all good.
This morning I used my co-workers SanDisk 1GB card and downloaded files from my FTP at 22KBps over EDGE which blew my mind. Furthermore, they weren't corrupted. His file system was FAT32.
My conclusion is that it isn't the formatting options, but the PQI cards and the old motto of "You get what you pay for". I am going to have to break down and buy another card which I really didn't want to do, but it's obvious that SanDisk clearly holds it's weight in these devices.
Thanks to everyone who made recommendations and turned me on to some great apps in the process. I'll update this when I get my new card and let you guys know how it went. Thanks again for being a great community!
EDIT: Could people without problems with a 2GB Post the following info to help those trying to buy a card?
Brand:
Part No:
Format Method
Type:
Sector:
Cluster Size:

Flash memory doesn't have heads or cylinders

I know, but the stat was there so I included it in case someone got a different value reported back to them...

soopahfly said:
Flash memory doesn't have heads or cylinders
Click to expand...
Click to collapse
Correct, but there may still be logical heads and cylinders for backwords compatibility with some OSes or software.
I dont know about the case with SD cards, but CF cards can be directly connected to an IDE bus and emulate an HD.

SD Card

Could anybody tell me, why my new SD Card (Panasonic 2 GB Class 6) is much slower on my Alpine than my old SD Card (Panasonic 2 GB Class 2)? Here are the results from the SK Tools benchmark :
Class 2 Card: Read 6187 kb. Write 636 kb.
Class 6 Card: Read 729 kb. Write 481 kb.
Isn't it funny?
Perhaps I should format the SD Card properly?
Any ideas?
Thank you.

are cards empty when you check write speed?
class tells about writing speed on complitely empty cards

I tried both benchmarks, with the empty and the full card. The class 2 is much faster, especially in the write result. Unfortunally I formatted the new card on my device, with the effect that the card was become more slower. After that I formatted the card on my computer, now it's better, but nevertheless slower than the old one.

maybe it's something wrong with the card
the 2nd one is almost 10 times slower readed :/
did you check speeds on PC?
maybe PPC just can't handle with faster card

deezer said:
maybe it's something wrong with the card
the 2nd one is almost 10 times slower readed :/
did you check speeds on PC?
maybe PPC just can't handle with faster card
Click to expand...
Click to collapse
Well, that's my question. Where can I get the adequate information? How can I check the speeds?

use this
http://www.simplisoftware.com/Public/index.php?request=HdTach

Now I've found out that SD/SDHC Memory Card file systems formatted with generic operating system formatting software do not comply with the SD Memory Card specification. You need a special formatting program that complies with the SD Memory Card specification.
Because I have a Panasonic card, I took the Panasonic free SW (
link: http://panasonic.jp/support/global/cs/sd/download/sd_formatter.html).
The benchmark results are: Nearly 14000 KB/s (read), but still 470 KB/s (write) only.
No idea, how to increase the write performance.

please help How big memory card xda2 suported and which types of card

How big storage card xda2 suported and which types of card it will support under wm6 , do big memorycard slow ur xda2 .thanks

If you have SDHC Card, you can help us to try driver in this thread
http://forum.xda-developers.com/showthread.php?t=351811
And then you can feel it

So far I haven't been able to get my 4 GB SD to work on my Hima...... any suggestions are welcome . It's an Emtec btw and it doesn't hold the HC logo, but I also can't use it in my camera so I think it's HC.
2 GB is currently the max I can use.
About the speed: the hardware is basically the bottleneck. I have several speeds up to 150, but there is no (noticable) difference between them in my Hima.

i bought kingsten 2gb sd card and its working perfectly
i bought kingsten 2gb sd card and its working perfectly, the dealer said to me larger then 2gb is not supported by xda2. sorry for my english,thanx all here

Up to 2GB SD card is supported, any SDHC card can and probably will cause problems, either till someone adapts the SDHC driver or till we give up hope.
But IF you're able to use SDHC on Hima, (without messing up any other feature) please tell us how you did it.

16GB MicroSD not recognized

MicroSD HC Sandisk 16GB not recognized as 16GB. Memory settings of storage card shows 3868MB. This is occuring on two different AT&T Tilt's 8925. One with older ROM.
Any ideas. The microSD card in an adapter shows up on the PC as FAT32 16GB so can't be a defective card??

telhack said:
MicroSD HC Sandisk 16GB not recognized as 16GB. Memory settings of storage card shows 3868MB. This is occuring on two different AT&T Tilt's 8925. One with older ROM.
Any ideas. The microSD card in an adapter shows up on the PC as FAT32 16GB so can't be a defective card??
Click to expand...
Click to collapse
Repartition using gparted! If still doesn't work it's a fake one.

sounds to me like a cosmetic non-issue.
you see, the software/OS on the phone determines available space and free space using in-memory counters (variables in a programming language). often, the developer might choose a variable type that doesn't have enough "range" to count up to 16GB. so it "overflows" one or more times as it counts up to 16GB, eventually landing on an overflowed value of 3868MB in your case.
if the card is showing up as 16GB on the PC, it is no doubt a 16GB card. on the phone side, you mention you tried it on two different tilts. did you happen to note exactly which ROM versions they were using (its not enough to say "older ROM")? it might be worth trying another ROM if the mentioned tilts were using WM6...maybe this free space counting bug was resolved in WM6.1 and/or later?
just my 2 cents.

flash a newer rom, a 6.5

I got the same problem with another device... and in the end I found that my card was a Chinese fake! They sell you a smaller card reprinted with larger size capacity... but the inside is still "small"! You can use a program called H2TESTW to check its integrity, however.