Benchmark Results: Access Time And I/O Performance
Access time and I/O performance are hardly relevant on portable memory products, such as these SD cards. Access time, particularly, is low on the list of must-consult metrics. However, I/O performance may be of interest for a small fraction of our readers, as it is indeed possible to run a full system installation on an SD or CompactFlash memory card. Industrial PC designs and systems based on the smallest form factors are possible use cases.
Read access time is equally quick on all of the SD cards in the test bed...
...while write access time differs significantly. The slowest product, PQI’s SDXC C10 card, actually requires 1.37 seconds, on average, to commence write operation. Keep in mind that this doesn’t really impact users working with digital cameras. But the benchmark triggers multiple random access operations, which the cards oftentimes fail to respond to in a quick fashion.
Since these cards were designed to read and write data sequentially, they are not very impressive when it comes to performing random read/write operations at varying block sizes. Most of the SD cards are comparable to hard drives from somewhere around 1995. Only SanDisk’s Extreme shows reasonable performance.
The Web server I/O test pattern does not involve write operation, which is why all cards deliver 3-4x performance of a conventional 2.5” hard drive.
How yesterday can you be. Lexar has a USB 3.0 Card reader (http://www.lexar.com/products/lexar-professional-usb-30-dual-slot-reader?category=213) that supports SDXC UHS-I and CF UDMA cards (dual slots that work simultaneously and can write from one card to another) for $50. This isn't a cheapo card reader and is designed for professional photographers/videographers but has a theoretical max of 500MB/sec* These claims conflict with the published limits of the yet unavailable UHS-II cards which max out at 312MB/s. The 60MB/sec limit (per Lexar) is the USB 2.0 level. *the 500MB/s is their claim
Where are the Panasonic cards???
Where are the Panasonic cards???
I was wondering same thing.
What I'd like to know, is that does leaving these cards in a laptop use battery life when the machine is OFF? It does on my Envy 13, resulting in a flat battery (probably a bug) and possibly on the TM2 as well.
VERY disapointed not to see other cards. easy to for kingstone to be first! competition sucks. But there are way better!!!! I wonder how much kingstone paid tomshardware for this.just one example: 16GB Delkin Elite633 SDHC UHS-I 95MB/s read & 80MB/s write
Maybe Toms asked others to provide cards and they didn't. it's not always as negative as you think!
Ha, running a system off of one of these is exactly what I'm doing. I've got my Open Pandora OS on a Samsung Plus. I can't actually tell the difference between that and running the OS from the internal NAND memory of the machine.
1KiB = 1000 bytes, not 1024!
Indicating the minor errors as I read the article :-)
Sandisk extreme pro is probably the only type of card to put an OS on. Not only does it have faster IOPS, it also has a better ECC, which is vital for an operating system to work on!
I'd not put any operating system on any other SD card; I've done it before, and it generally would take a couple of months before software read errors would appear!
Hmmm this is slower than what some compact flash cards have to offer. I bought on intending on using it as a cheap ssd for a old ibook.
not the fastest out there but certainly good. As for SD card in this review seam a little high but very nice roundup.
http://www.newegg.com/Product/Prod [...] 6820208529
90mb/s read isn't to bad
1KiB = 1000 bytes, not 1024!
I think the author was pointing out the difference between marketing kilobytes which is a power of 10 (10^3) versus computer kilobytes which is a power of 2 (2^10). Marketers have been advertising storage as a power of 10 for a long time now. What is new is that they are using KiB to indicate 2^10 and KB to indicate 10^3. This is suppose to replace the old designation based on case (mB for 10^3 and MB for 2^10) since people aren't always careful or aware of the case meaning.
I'm not personally in favor of the new meaning, but the marketers have won out. You can see these KiB, MiB, ... definitions in wikipedia and some newer OSs.
VERY disapointed not to see other cards. easy to for kingstone to be first! competition sucks. But there are way better!!!! I wonder how much kingstone paid tomshardware for this.just one example: 16GB Delkin Elite633 SDHC UHS-I 95MB/s read & 80MB/s write
Where are the Panasonic cards???
Except there are flaws concerning your statement.
First, the Lexar, and Sandisk memory cards have been around for more than 2 years. e.g. they are not based on some brand new technology. As a matter of a fact. I am willing to bet all the cards except the Kingston are all based on a few years old technology.
Secondly, This is read only in a card reader, and not write capability in a camera. So if you're wanting to use this in a camera. Your camera wont perform any better.
Most professional photographers will probably still use either the Lexar, or Sandisk memory cards. Mainly because they have been thoroughly tested in professional camera systems, and have been found to perform very well. Well, that is to say, those that even use SD card based Camera systems. Which will probably not be very many( except perhaps in secondary cameras ). Most photographers wanting/needing performance, will probably use a system that allows them to use CF media for the best performance.
Transferring pictures to a computer after having taken them in a camera is often a far distant second concern. However, assuming this is important. Perhaps you could/should consider investing that money into CF media instead. Where is makes the most sense.
For boot media, there are plenty of other options that make more sense( including, but not limited to CF media ). But in the event that you *have* to use SD media. Chances are very slim that the given system will support the latest/greatest cards to take full advantage of their speed capabilities.
How come San Disk Extreme, Class 10 is now in the bulk of the class 10 cards, while in the previous benchmarking article it was clearly standing out?
http://www.tomshardware.com/review [...] 574-8.html
1KiB = 1000 bytes, not 1024!
1 KB = 1 kilobyte = 10^3 = 1000
1 KiB = 1 kibibyte = 2^10 = 1024
The writer has come to a rather odd conclusion. In every test except peak read the Sandisk pro is similar or better than the Kingston. At half the price I would highly recommend the Sandisk over the Kingston any day.
Except there are flaws concerning your statement.First, the Lexar, and Sandisk memory cards have been around for more than 2 years. e.g. they are not based on some brand new technology. As a matter of a fact. I am willing to bet all the cards except the Kingston are all based on a few years old technology.Secondly, This is read only in a card reader, and not write capability in a camera. So if you're wanting to use this in a camera. Your camera wont perform any better.Most professional photographers will probably still use either the Lexar, or Sandisk memory cards. Mainly because they have been thoroughly tested in professional camera systems, and have been found to perform very well. Well, that is to say, those that even use SD card based Camera systems. Which will probably not be very many( except perhaps in secondary cameras ). Most photographers wanting/needing performance, will probably use a system that allows them to use CF media for the best performance. Transferring pictures to a computer after having taken them in a camera is often a far distant second concern. However, assuming this is important. Perhaps you could/should consider investing that money into CF media instead. Where is makes the most sense.For boot media, there are plenty of other options that make more sense( including, but not limited to CF media ). But in the event that you *have* to use SD media. Chances are very slim that the given system will support the latest/greatest cards to take full advantage of their speed capabilities.
As I pointed out earlier. Lexar nows sells a USB 3.0 card reader that supports SD (in all its flavors, including UHS-I versions) and high speed CF media with two slots that even allow for reading/writing from one card to another. At only $50 from a respected company like Lexar, if I was a pro photographer transferring a lot of RAW files, buying one of their card readers would be a no brainer.
Tom, I think you have done a great job with this report, the mArket is a confusing jungle and your report will help greatly, any ideas for what can be done about all the fake cards out there?
roger@abbeyland.co.uk
How does does the read/write performance of a very-high speed SD card compare on the listed USB 3.0 reader, the previously mentioned Lexar USB 3.0 reader and a selection of ExpressCard-based readers? I'm interested in a USB 3.0 reader, but without anything that currently has a USB 3.0 port, I'm stuck with some kind of adapter, so why not just skip to an ExpressCard version?
The only companies I trust my data with is either Panasonic or Sandisk. For my ultra sensitive and secure data only goes on my IronKeys.
Was Panasonic invited to this review?