Okay come!  Class 10 write rate is not always guaranteed!

Okay come! Class 10 write rate is not always guaranteed!

64GB SDXC C10 SaveTec U1 UHS-1 memory card Extreme Speed ​​Class10 Class 10 64GB Full HD video up to 60MB / s for Samsung Canon Nikon Sony Digital

Customer Review

The reading rate is always good, but the writing rate varies greatly, probably also because of the internal wear levelings and possible internal buffer memory of the card (which also may eject through ejection / only then synchronized back, it is difficult to correct benchmarking). The Class of 10 actually guaranteed 10MB / s are not always achieved!
They can probably only be achieved if properly aligned (aligned) is written (a standard format with the ext2 file system, for example resulted only write speeds of up to 1.1MB / sec !, Samsung F2FS but is similar to exFAT in the writing speed)

First, I have the map complete with data overwritten in order to be able to test in "the steady" state.

- Speed ​​Test:
Has been tested with the Linux tool "dd" and block size 1M, with direct access to the device (/ dev / sd * 1), the command "sync" has been executed partly shortly after start of writing to no cache to write synchronously, for Compared were a few tests were done once with a synchronous gemountetem exFAT reached at the similar rate.

In my Transcend RDF5 USB3.0 Card Reader (Card Reader Maximum: 90MB / s read, 60MB / s write) I could reach following sustained transfer rates:

Writing 16MB with sync: 37 MB / s, 14.9 MB / s,

Reading 128MB: 81.1 MB / s
3x writing 128MB without sync: 24.1 MB / s, 32.9 MB / s, 25.3 MB / s
3x letter from 128MB to sync: 9.1 MB / s, 12.9 MB / s, 17.5 MB / s

Reading 2GB: 83.9 MB / s
3x 2GB writing without sync: 37.1 MB / s, 29.6 MB / s, 29.0 MB / s
3x letter from 2GB to sync: 19.3 MB / s, 15.3 MB / s, 18.7 MB / s

unaligned (unaligned) letter (ext2) of 16MB with sync: 700 kB / s, 1.1 MB / s, 980 kB / s

Conclusion: Under ideal conditions therefore seem 37MB / s write rate to be reached, but surely that's never. Reading, however, is great!

- Coarse reliability test
Since I schonmal Fake cards had been able to maintain, unfortunately, in real only 2GB data but could be formatted as 16GB, I have also tested:
I have the card completely filled with copies of Debian Linux DVD ISOs and other several small writes and eject / reinsert again all checksums tested, all of which were 100% correct. Long-term tests are still pending, I hope the card maintains a while ...

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