Canon CHDK - Manual (Page 47)

A720IS
Memory Card Benchmarks Example
(Guide only, many variables to be considered) Speed (Kb/s)
SD-card model, size
Write
(RAW)
Write
(Mem)
Write
(64k)
Read
(64k)
Canon, 16MB (bundled) 2254 1859 1754 3508
A-DATA Speedy, 2GB (FAT16) 2254 3164 2532 5572
Kingston, 2GB Ultimate 2254 10326 7692 6742
Transcend, SD 4GB, Standard (FAT16 fresh format) 2254 3980 3623 5930
Transcend, SD 2GB, 80x 2254 7629 5505 6476
Transcend, microSD 2GB, Standard speed, MLC 2254 5358 5468 9153
ByteStor, SD 1GB, 50x 2254 8060 6132 7021
SanDisk, SD 1GB, Ultra II 60x 2254 8840 5591 6606
SanDisk, SD 2GB, Ultra II 60x (fresh format) 2254 9600 7123 8445
SanDisk, SDHC 4GB, Ultra II 60x (FAT16 fresh) 2254 8718 5627 6715
Sandisk, SD 2GB, Extreme III 133x (fresh format) 2254 10686 7594 8316
EMTEC, SD 2GB, 60x (FAT16 fresh) 2254 8073 7407 8672
• Create card with two partitions
(See Notes section at end for late news)
This option creates a 2 MB FAT partition on the SD card, that's fixed on the code for now. Copy
the CHDK firmware extensions to this partition and load them, (The DISKBOOT.BIN and
PS.FI2 files). Then select "Make card bootable" in "
Main Menu > Miscellaneous stuff ", so it does
not complain when you write-protect the card.
Next step is to select "
Swap partitions " in " Main Menu > Miscellaneous stuff ", this will hide this
small partition and make the larger FAT32 one visible. We need to format it, and copy CHDK
files DISKBOOT.BIN and PS.F I 2 to it too, so we can perform "swap partitions" again. So
format it in FAT32, copy CHDK, insert it on the camera and load CHDK using "Firmware
Update", Select "Swap partitions" and "Make card bootable", write-protect the SD card, (lock
with slider on side of SD card) and power-cycle the camera. It should now load CHDK from the
small 2 MB partition, but have access to the larger FAT32 partition to store pictures, video and
the CHDK folders.
BEWARE: This can DELETE ALL data on the card !
This feature is used with SDHC cards larger than 4GB, on supported cameras (needs
multi partition support) it will create a small FAT16 partition with a size of 2MB for
CHDK and a larger partition formatted as FAT32 to store the images. On such a
prepared card the camera boots up CHDK from the small partition, then the partitions
are automatically swapped, this way the full capacity of the FAT32 partition can be used. The
partitions are not shown correctly under MS Windows, only one of the two partitions is shown, to
access the other partition without a special system driver, the partitions should be swapped with
"Swap partitions"
45