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I am copying a folder (320 items, 1.9GB) on an SSD to a different location on the same SSD and getting a transfer rate of 5MB/s.

Is this to be expected? Simultaneous reading and writing to the same drive will slow things down, but still - I would guess this rate is slow.

I get these values from HDTune benchmark:


Transfer rate: min=12.6 avg=16.4 max=16.8 MB/s

Access time: .300ms

Burst rate: 17.9MB/s

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How full is the drive? – boehj May 20 '11 at 13:29
What SSD is it? Also, for context, what sort of transfer speeds to you get copying the same folder to/from a different drive (if you have another drive)? – sblair May 20 '11 at 13:44
It is very full: 6GB free of a 128GB drive. – mackenir May 20 '11 at 13:45
I don't have another internal drive. the SSD shows up as "Samsung SSD RBX Series 128GB M ATA Device" in device manager. – mackenir May 20 '11 at 13:50
Not exactly the fastest according to this… – sgmoore May 20 '11 at 15:23
up vote 3 down vote accepted

Sounds like you think all SSD's are equal (or near equal) which is not true. See, for example these benchmarks

Also the speed is not just dependent on the SSD.

But no, I would not consider 5Mb/s to be particularly fast.

For example, the last real copy I did that I can remember (around 2Gb and 10,000 files) was reported by Windows as around 40Mb/s. (This is on an Intel SSDSA2M080G2GC SSD which is over a year old and hence may not be particularly fast)

HD Tune: INTEL SSDSA2M080G2GC Benchmark

Transfer Rate Minimum : 88.8 MB/sec
Transfer Rate Maximum : 221.3 MB/sec
Transfer Rate Average : 210.0 MB/sec
Access Time           : 0.1 ms
Burst Rate            : 144.8 MB/sec
CPU Usage             : -1.0%
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Maybe your SSD garbage collector is full and overloaded. Transfers to SSD tends to be better if you put your SSD in idle for some time. Howerver you could try a firmware upgrade for it.

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You can measure the real effective transfer speed of you SSD/HDD with HDTune or HDtach.

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Thanks, I'll give that a try. – mackenir May 20 '11 at 13:45

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