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Customer Review

1 of 1 people found the following review helpful
2.0 out of 5 stars Did not match the expected speed., 17 Oct. 2013
Verified Purchase(What is this?)
This review is from: Samsung 16GB Class 10 UHS-1 Grade 1 80MB/s SDHC Pro Memory Card Bulk Pack (Electronics)
At 67MB/s read and 27MB/s write, the card is noticeably slower than expected. Not slow enough that I am sending it back, but still a disappointment.
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Showing 1-5 of 5 posts in this discussion
Initial post: 18 Nov 2013, 15:58:27 GMT
Please what did you use to test ?

In reply to an earlier post on 18 Nov 2013, 17:27:30 GMT
CrystalDiskMark and my laptop's integrated card reader that from the 67MB/s reading speed (and near 45MB/s writing with a Sandisk) I gather should be able to take full advantage of UHS-1 cards.

In reply to an earlier post on 25 Nov 2013, 03:28:04 GMT
Last edited by the author on 25 Nov 2013, 03:29:29 GMT
Thanks for answering. So the integrated card reader should work on a bus equal to USB 3 speeds ? I thought the card reader bus would be equal to the "USB" bus as they work on the same motherboard. So when it is wired on a certain bus it is obviously covering the whole system at same speed. I am very skeptical of these cards as I do not understand trough what kind of deal SAMSUNG would like to provide these memory to vendors in a jiffy bag rather than in the original Samsung counterfeit-proof packaging produced by Samsung themselves; but would you not think that the internal card reader like any other external USB plug-in devices would bottle neck the actual speed in case of the Serial Bus 2 ? I bought one and at a first look the markings on the back tell's me "original" but the look isn't as rich as in pictures especially because of some bumps underneath the blue coating on the front but I could be just the way they are made.

In reply to an earlier post on 25 Nov 2013, 08:30:08 GMT
All I can say is that with a Sandisk 45MB/s the reader almost reaches the speeds of the card. Here's the results for that card.

Sequential Read : 45.132 MB/s
Sequential Write : 39.190 MB/s
Random Read 512KB : 45.070 MB/s
Random Write 512KB : 3.584 MB/s
Random Read 4KB (QD=1) : 5.321 MB/s [ 1299.1 IOPS]
Random Write 4KB (QD=1) : 0.752 MB/s [ 183.6 IOPS]
Random Read 4KB (QD=32) : 4.388 MB/s [ 1071.3 IOPS]
Random Write 4KB (QD=32) : 0.796 MB/s [ 194.3 IOPS]

Here's the results for the Samsung card

Sequential Read : 66.282 MB/s
Sequential Write : 27.906 MB/s
Random Read 512KB : 67.117 MB/s
Random Write 512KB : 12.145 MB/s
Random Read 4KB (QD=1) : 5.525 MB/s [ 1348.8 IOPS]
Random Write 4KB (QD=1) : 1.005 MB/s [ 245.3 IOPS]
Random Read 4KB (QD=32) : 5.735 MB/s [ 1400.2 IOPS]
Random Write 4KB (QD=32) : 1.047 MB/s [ 255.5 IOPS]

I also have a Trascend UHS-I card that reads at over 80MB/s, but writes only at about 30MB/s. I am completely sure that my reader is not the bottleneck for this card and yes, the card looks authentic and from a marketing perspective the lack of packaging is confusing, but from the point of view of logistics it makes a lot of sense.

In reply to an earlier post on 28 Nov 2013, 09:44:07 GMT
Alright. Would be curios to compare it with the one packaged.
Anyway Thank you Aram.
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