Sandisk 512 MB Secure Digital Ultra II (SDSDH-512-901, Retail Package) by SanDisk
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Digital camera reviews of Sandisk 512 MB Secure Digital Ultra II (SDSDH-512-901, Retail Package)
Digital camera Review: Performance is worth the price premium.
Summary: 4 Stars
I just received a SanDisk 512MB Ultra II Secure Digital card and did a quick & dirty performance comparison with the non-ultra SanDisk SD card. If you just want the results, then go to the bottom of the review. For the more inquisitive, here is my test configuration:linux-2.4.22 (with ehci to enable usb2.0) connected to . . .
usb2.0 hub connected to . . .
SanDisk SDDR-88 usb2.0 memory card reader
commands for the write test:
- mount -o noatime,sync /dev/sda1 /flash_memory
- cat testfile > /dev/null
- time cp tesfile /flash_memory
The first command forces any writes to the flash_memory to happen immediately, so there is no caching going on. The second command reads through the ~50MB testfile and caches it into memory (no need to access the hard disk). The third command actually copies the test file to the memory card and times it.
commands for the read test:
- umount /flash_memory
- mount -o noatime,sync /dev/sda1 /flash_memory
- time cp /flash_memory/testfile /dev/null
The first command unmounts the flash memory and clears the cache. The second command mounts the flash memory so the computer can access its files. The third command actually copies the file, which must be read directly from the card because we cleared the cache, and times the copy.
The read and writes tests were performed multiple times, and the results varied little between iterations. The 512MB card was completely empty, and the 256MB card had a small 3MB file.
The SanDisk Ultra II card turned in some impressive numbers:
writes: 4.95MB/sec (5048.2KB/sec)
reads: 8.19MB/sec (8389.96KB/sec)
For comparison, here are the numbers for the SanDisk 256MB non-ultra card:
writes: 0.86MB/sec (876.44KB/sec)
reads: 1.53MB/sec (1570.69KB/sec)
If you need performance, then the SanDisk Ultra II series is the way to go. The Ultra II reads and writes more than five times as fast as the plain-vanilla SanDisk secure digital card. In my case, I will be using the card to store MP3 files for a portable audio device, and waiting around while moving MP3s is not how I want to spend my time. So, I bought the Ultra II. Your needs may vary. Buy accordingly.
Also, I realize that other manufactures market "high-performance" memory cards, but since I don't own one, I can't recommend/jeer them here.
Digital camera Review: Poor build quality
Summary: 2 Stars
I did a fair bit of trawling before settling on this card for my Canon S2 IS, earlier this month. On paper and screen this SanDisk 512MB Ultra II card looked the part and for the first 2 weeks of use, it was (yes, it is reasonably fast).
Thereafter, the 'lock' slide became loose; such that every time the card was inserted into the camera, the slide moved back into the 'lock' position...effectively making it impossible to record on the card any more. Most annoying! And I'd removed and re-inserted the card (after downloading images via my card reader) not more than 10 times before the slide became loose!
On close inspection, the plastic used for the 'lock' slide, as also, the entire shell of the card seems to be flimsy and low-grade (compared to an older/regular 64MB SD card I also have); which is probably why it began to malfunction so quickly. What is most surprising is that we are talking about an Ultra II hi-speed card, supposedly 'professional' grade...no less! Huh?
For those who faced a similar problem - I fixed it with a very tiny drop of superglue - very carefully glued the slide in the 'unlock' position...and the card works fine now :-))
Digital camera Review: Really quick in PC and camera
Summary: 5 Stars
the Ultra speed has made a big difference in using it with my PC and also in my camera.Digital camera Review: Realy Faster
Summary: 5 Stars
It's really faster to the normal ones.
I deply recomend to use this kinf for cameras, when you to take a lot of picures one after other.
Digital camera Review: San Disk Ultra II 512 mb
Summary: 5 Stars
I am just learning about digital cameras and have my first one. My neice helped me order this item that she says is the best. I have not used it yet.