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Thursday, October 31, 2013

Product review: V7 32GB SDHC Class 4 Flash Memory Card (VASDH32GCL4R-1N)

This V7 SDHC class 4 SD memory card has 32 GB capacity. This capacity allows you to store 5416 photos each one is 12 MegaPixels or 250 minutes of 13 Mpbps HD video. The memory card has a 5 year limited warranty.

I measured the performance of the SDHC memory card with several utilities and found it to be pretty good. It falls in the mid range of various memory cards I have tested in the past, it is neither the slowest nor the fastest.

To test various memory cards I run the same set of tests so I can compare them to each in "apples to apples" comparison, this way if some unit does not perform well I notice it by comparing it to other devices I have tested. My test consist of copying a large set of mp3 files totalling 638916 Megabytes.

V7 SDHC write performance:
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✔ 1.178s (cpu) 2:01.43 (clock time)

For comparison I including numbers for copying the same set of files to SanDisk USB2 memory stick, Transcent microSDHC class 6 card, to hard disk of my computer,

✔ Transcent microSDHC : 1.482s (CPU time), 1:33.97 (clock time)
✔ SanDisk USB2: 1.358s (CPU time), 1:23.53 (clock time)
✔ Hard Drive: 0.573s (CPU time), 0:00.58 (clock time)

For read performance test I use Linux Disk Utility Benchmarks.

V7 SDHC Read-only performance:
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✔ Minimum read rate 15.6 MB/s
✔ Maximum read rate 22.3 MB/s
✔ Average read rate 21.9 MB/s
✔ Average access time 0.8 ms

The only small negative I have to say that the packaging of the card does not include a plastic case which is included with some other cards. I like having a spare memory card when I travel and find these cases pretty handy.

I was supplied a sample for testing and an honest review, be it positive or negative.


You can find it on Amazon by following this link.



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