SD vs CF flash cards?

[Zazz]

Just to rule out any sash type jigory pokery optimization stuff, could you possible test your internal flash?

I get 42.120s for 80m, 23.465s for 40m and 4.940s for 10mb.
I used the same command line just changed count= to 10,40, and 80.

Due to space constraints I can only do the 10MB test (even though I have a single 121MB partition)...  I get 4.85 +- 0.10 sec.

[zbones]

I get 4.85 +- 0.10 sec.

OK, thats good enough for me it is close enough to be classed as the same speed.

 I take it you can use it as ext2/3 without any nasty going read only issues or io  error issues?  If so my next sd card purchase will be one of these, unless anybody can beat 1.6mb/sec

[Miami_Bob]

My own small contribution to the cause:

SanDisk SDSDB-512-768 Secure Digital Card

time sh -c \'dd if=/dev/zero of=/mnt/card/dump bs=1024k count=80; sync\'

real 0m46.384s
user 0m0.020s
sys 0m27.950s

replicates +/- 2-3 sec \"real\"


SanDisk SDCFB-512-768 Compact Flash Card

time sh -c \'dd if=/dev/zero of=/mnt/cf/dump bs=1024k count=80; sync\'

real 0m24.284s
user 0m0.020s
sys 0m4.470s

replicates +/- ~2 sec \"real\"


Internal Flash

time sh -c \'dd if=/dev/zero of=/home/zaurus/Documents/dump bs=1024k count=10; sync\'

real 0m4.648s
user 0m0.050s
sys 0m4.580s

time sh -c \'dd if=/dev/zero of=/home/zaurus/Documents/dump bs=1024k count=20; sync\'

real 0m9.248s
user 0m0.030s
sys 0m9.080s

time sh -c \'dd if=/dev/zero of=/home/zaurus/Documents/dump bs=1024k count=40; sync\'

real 0m18.523s
user 0m0.030s
sys 0m18.170s

time sh -c \'dd if=/dev/zero of=/home/zaurus/Documents/dump bs=1024k count=80; sync\'

real 0m39.240s
user 0m0.030s
sys 0m36.430s

replicates well


The 2 storage cards were both purchased locally on impulse because they had significantly discounted prices (after the %#$@*&! MIRs, of course). No obvious pedigrees that the packaging indicates.

YMMV



Bob W

[rgrep]

Thanks !

Is there any way to check an existing FAT32-formatted card, without erasing it ?

Yes, just go to a terminal window, su to root and type the following:

umount /mnt/card
badblocks -sv /dev/mmcda

(Note /dev/mmcda instead of /dev/mmcda1.  You can scan just /dev/mmcda1 if you like, but using /dev/mmcda will scan the whole card including data outside of the first partition.)

If this shows up bad blocks, you can use the -o option to write a list of bad blocks to a file, e.g.:

cd /tmp
badblocks -svo sd_card_badblocks /dev/mmcda

You can then use this file to tell mkfs which blocks to skip (has the same effect as running mkfs with -c but means you don't have to scan the card again).

[Rork]

Hi Guys,

Just gotten my C860 directly from Japan and have performed most of the conversion to English from the original Sharp ROM 1.40JP.  

I have also bought a CF Kingston 512MB Elite PRo given as 5MB/s for writing (2X std CF speed).  

The CF works fine with the Z already the overall OS, but, no way to get NAND backup done.  From the service menu, the Z starts the backup process but never hits the point when you have to respond yes before it goes. Removing the CF showed that the Z is trying to test/initialize the CF card.
I tried with another Kingston 512MB std speed and the backup worked (I have not tested any restore yet).

At this point, I think that the soft performing the NAND backup is not able to handle the High Speed CF but would like to have confirmation.

Anybody of you has a Kingston Elite Pro CF and tried already NAND Backup on it?

Thanks

[shuba]

my digicam came with a 32 MB SD card, can i use a CF card in the same slot?