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Rating: 
Summary: How many pictures will it store?
Review: How many pictures will it store? It is the most commonly asked question from digital camera enthusiast but usually the question that is the most difficult to get a straight answer about. Well, considering I worked in the memory industry for over 7 years I can help clarify this perplexing question and do so unbiased as I have since changed industries.
The Sandisk 512MB Secure Digital Ultra II, like most 512MB cards, will store on average 568 pictures when used with a 2 megapixel camera, 426 images when used with a 3 megapixel camera, 256 pictures when used with a 4 megapixel camera, 204 images when used with a 5 megapixel camera, and 160 pictures when used with a 6 megapixel camera. These numbers are based off the assumption that you are going to shoot your images at the highest quality JPEG setting available for the camera and understand that they are estimates and may be off by as much as 10 percent due to numerous factors including the complexity of the scene being shot and the compression algorithm used by your specific camera.
I truly hope this review was helpful to you in determining whether this 512MB card is the right capacity for your specific needs.
Rating:
Summary: Big. Fast.
Review: BIG. If you have a 3 megapixel camera or higher, then this SD card is for you. You should take all your pictures at the highest resolution and the least compression as possible. For 3 mp cameras, each picture will be about 1 MB to 1.5 MB (more than 300 pictures in this card). For 4 mp cameras, each picture will be about 2 MB (about 250 pictures in this card). This card will allow you take a LOT of pictures before you'll have to unload to your computer.
FAST. This card not only carries a lot of storage space, this is also fast. Even if the card is full, you will be able to download all your pictures to your computer in under a minute instead of several minutes on a regular card.
Rating:
Summary: Great Card
Review: I have purchased the Sandisk 512 MB Secure Digital Ultra II for my newly acquired Kodak 7590 digital camera. So far I have no problem with it. I also use it on my Toshiba notebook which has a built-in SD-card reader. So far it works fine on the notebook computer too. I have read customers' review for the Sandisk 256 MB Secure Digital Ultra II. People were complaining about the card went dead on them after some time of use and they are returning the card for refund. I hope this will not happen to me.
So far, I am very happy with it. It stores more than 200 pictures at 5MP @ Fine JPEG Compression. As for the speed of the card. I can't really tell the difference when I compare it with a regular Sandisk 512 MB Secure Digital card. Both seems to work just as fast in the digital camera and the notebook computer.
Rating:
Summary: WOW!!!! THIS THING IS AWESOME!!
Review: I just bought this thing from Amazon and all I can say is WOW!!!! This is probably the best purchase I have ever made. This thing is everything I ever expected and more!! It's very easy to use as well! I have bought other brands before, and this one just blows everything else out of the water! I have to say, everyone out there who is thinking of buying this, stop thinking. I bought it and I am extremely happy with it the moment I powered this thing on. YOU ABSOLUTELY POSITIVELY CANNOT GO WRONG WITH THIS PURCHASE! I GUARANTEE IT!!!
Rating: 
Summary: Performance is worth the price premium.
Review: 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.
Rating: 
Summary: Test memory ASAP
Review: 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.
Rating:
Summary: Performance is worth the price premium.
Review: 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.
Rating:
Summary: Test memory ASAP
Review: This performed as wonderfully as other reviewers describe -- until I came close to filling it. Then it would not format via camera or computers. Of course, this occurred a week out of warranty. Lesson: I shall now exercise every bit of memory as soon as I receive it -- fill it fast or slow with data. That applies to all sizes and speeds of course.
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