New SD card

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holmes901

Senior Member
Jun 18, 2009
683
289
Orlando
My gf was nice enough to get me a 4gig class 2 sd card...I was wondering if there were any downsides to me having this and if any could then be fixed withough having to get a class 6 which from my searches and reading in the forums if a really good investment.
 

brian_v3ntura

Senior Member
Jan 8, 2008
1,130
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Jacksonville , FL
My gf was nice enough to get me a 4gig class 2 sd card...I was wondering if there were any downsides to me having this and if any could then be fixed withough having to get a class 6 which from my searches and reading in the forums if a really good investment.

downsides is..class 2 wont run roms as fast as class 6. but still pretty much usable


4gig class 6 on newegg.com is now about 14 after shipping
 

naguz

Senior Member
Jan 30, 2009
294
12
sd cards and class ratings

The problem with sd cards, are that the rated class is often way off. They often perform much better.
For example, I have two kingston class 5 cards, that have read speeds at 12.5MB/sec, and one Sandisk class 4 with read speeds at >16MB/sec.

As comparison, I have a no-name class 6 that barely reads at 8MB/sec.

All three brand name cards also writes faster than the no name class 6. So why they are rated class 4 and not 6 is a mystery to me.

Ideally, we should have a thread where people posted the read/write speed of their sd crads, and included a link to where you bought it from. Mymemory.co.uk is a good place to get them from, in my expoerience. Does anyone know of online shops shipping worldwide that actually states the r/w speed of the cards? Or better yet, a table/wiki with this information?

To answer OPs question though: Class 2 will probaby be slow with Hero-roms or apps2sd. But you cn always test it and see how well it performs. I imagine reading speed is most important.
 

prince.siraj

Senior Member
Feb 18, 2009
979
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26
Loma Linda
The problem with sd cards, are that the rated class is often way off. They often perform much better.
For example, I have two kingston class 5 cards, that have read speeds at 12.5MB/sec, and one Sandisk class 4 with read speeds at >16MB/sec.

As comparison, I have a no-name class 6 that barely reads at 8MB/sec.

All three brand name cards also writes faster than the no name class 6. So why they are rated class 4 and not 6 is a mystery to me.

Ideally, we should have a thread where people posted the read/write speed of their sd crads, and included a link to where you bought it from. Mymemory.co.uk is a good place to get them from, in my expoerience. Does anyone know of online shops shipping worldwide that actually states the r/w speed of the cards? Or better yet, a table/wiki with this information?

To answer OPs question though: Class 2 will probaby be slow with Hero-roms or apps2sd. But you cn always test it and see how well it performs. I imagine reading speed is most important.

Sandisks are on average the fastest of the flash memory cards... and i believe you pay a slight premium for it? i have one, but from amazon for like $30 so idk
 

Ssantos6981

Senior Member
Oct 17, 2006
385
1
39
Yonkers
I had a classless 2 gb card and it runs just the same as this sandisk 8gb class 6.

I don't see what everyone talks about. I tried them both on cm 4.0.4 and now with this new CM and I don't see a significant difference.

I'm running like 7 widgets all over the 5 pages.

Maybe I just can't tell...
 

prince.siraj

Senior Member
Feb 18, 2009
979
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26
Loma Linda
I had a classless 2 gb card and it runs just the same as this sandisk 8gb class 6.

I don't see what everyone talks about. I tried them both on cm 4.0.4 and now with this new CM and I don't see a significant difference.

I'm running like 7 widgets all over the 5 pages.

Maybe I just can't tell...

yeah it seems that the classless cards, although slower on file transfers, are not maximizing bandwidth with swap and stuff so looks like it's even... and only SDHCs have a class looks like. my stock G1 card worked fine but crashed a few times with apps2sd... running hero is probably why though.
 

ofsinreno

Senior Member
Nov 11, 2009
532
100
The class refers to the minimum read/write speed necessary for continuous streaming of information, not the maximum read/write speed (more important for digital cameras and camcorders than our devices). The common misconception is that a class 6 card is faster than a class 2 card. You have to be aware of the MAXIMUM read/write speed which will tell you which performs better: ie- you may have a class 2 with a higher read/write speed than the class 6 which would make the class 2 faster.
 

prince.siraj

Senior Member
Feb 18, 2009
979
0
26
Loma Linda
The class refers to the minimum read/write speed necessary for continuous streaming of information, not the maximum read/write speed (more important for digital cameras and camcorders than our devices). The common misconception is that a class 6 card is faster than a class 2 card. You have to be aware of the MAXIMUM read/write speed which will tell you which performs better: ie- you may have a class 2 with a higher read/write speed than the class 6 which would make the class 2 faster.

that usually happens when people get a lower-quality/class Class 6 card thinking they're all fast... fact is, Sandisk makes the Class 6 Mobile Ultras which get 16mb/s average and maxxed at 24mb/s once for me :D while some crappy Class 6's might just get the bare minimum for Class 6: 6 mb/s
 

ofsinreno

Senior Member
Nov 11, 2009
532
100
I have been following xda-developers since I unlocked my first at&t tilt, and people are always making that mistake! Just look up any HERO ROM and they will require "Class 6 micro-SD Card"! The fact is the class is not a potential speed rating, whether it is 2 or 6 or even 10! The class # refers to the lower limit of the device that is using the card, not the capability of the card. For example, if your device is capable of writing at 12Mb/s then you can use any class card rated at 12Mb/s regardless of whether it is a class 2 or class 6 and neither will be faster. Conversely if your device is only capable of writing at 4Mb/s then you cannot use a calss 6 card because the class 6 card requires a device to write continuously at lease 6Mb/s. Most people think that a class 6 card is labeled "class 6" because it is guaranteed to read/write at least 6Mb/s and a class 2 is labeled "class 2" because it is guaranteed to write at least 2Mb/s; but that is not true. The speed rating is not the same as the class rating. They have very little to do with one another.