Fast Sd Cards

[guima]

Hi,

I am going to upgrade my 256MB SD card to a 1GB SD card.
I am wondering if the Zaurus will be able to take advantage of the faster cards currently in the market.
Since these cards are tipically a factor of 2 more expensive I would only buy them if there is indeed an actual speed improvement with the Zaurus.

Could you please let me know your experiences with using fast SD cards with the Zaurus? I am most interested in the 1GB cards, but smaller cards info is also welcome.
Which cards are you using, and have you noticed a performance improvement relative to slower cards?

My zaurus is the c860.

Thanks.
Joao

[david_dahan]

Hi,

I am going to upgrade my 256MB SD card to a 1GB SD card.
I am wondering if the Zaurus will be able to take advantage of the faster cards currently in the market.
Since these cards are tipically a factor of 2 more expensive I would only buy them if there is indeed an actual speed improvement with the Zaurus.

Could you please let me know your experiences with using fast SD cards with the Zaurus? I am most interested in the 1GB cards, but smaller cards info is also welcome.
Which cards are you using, and have you noticed a performance improvement relative to slower cards?

My zaurus is the c860.

Thanks.
Joao
[div align=\"right\"][a href=\"index.php?act=findpost&pid=109460\"][{POST_SNAPBACK}][/a][/div]

Hi Joao,

I tried the PRETEC Secure Digital 512MB x133 and failed , the Zaurus managed to work with a slower card PRETEC Secure Digital 512MB x66 .
seems that the SD interface in the Z is speed limited and can not take the advantage of the new cards .

David.

[pgas]

https://www.oesf.org/forums/index.php?showtopic=8659
https://www.oesf.org/forums/index.php?showtopic=7730
https://www.oesf.org/forums/index.php?showtopic=6487

[guima]

David, pgas,

Thanks for your replies.
It seems like it is worth going for a middle speed card (x44)  but not the fastest one on the market.
I'll do that. The price difference is considerable.

-Joao

[Da_Blitz]

you forgot: https://www.oesf.org/forums/index.php?showtopic=16826

althogh its off topic to the original post they do talk about SD cards and the guy writing the new SD card driver:

I got this message off the opentom mailing list from Thomas Kleffel:

Hi,

ok, I think i need to clear up the SD-Card confusion a bit. There are currently 3 different SD card drivers there.

1) the early binary driver from TomTom (sd.o). Even if it is listed as GPL, it is not availabla as source. This is not TomTom's fault. TomTom signed a contract with the SD card driver association that forbids them to disclose their oh-so-secret intelectual property...

2) the early OpenTom driver. This is a hack I did about a year ago when driver #1 was only available for 2.4. I hacked SD-Card support into the MMC framework. This was only a quick hack, but however the 2.6.14-SD-Card support is somewhat based on it.

3) the new OpenTom/TomTom driver. I was paid by TomTom to develop a new open source SD card driver. It modifies the current MMC framework and is pretty stable and fast (6-8 MB/s). It is a clean implementation as I didn't sign anything with those SD-Card people. It is almost finished and will be available "really soon" â„¢.

So, what do those drivers do?

1) stable, a bit slow, closed source, no 2GB cards
2) stable, really slow, open source, no 2GB cards
3) stable, really fast, open source, 2GB cards - but not yet available wink.gif

I will talk to Christian about getting my hands on a Zaurus.

Best regards,

Thomas