Canon CHDK - 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.FI2 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"
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