Slow m4 512GB SSD when copying large files...

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Kilobyte Kid

Slow m4 512GB SSD when copying large files...

As stated in the subject... Can't believe it's slower than a USB2 thumb drive =(

 

It started out fine (400+MB/s) then it slowed to a crawl... 

prob.png

 

(in case you're wondering, that is a genuine windows 8 rtm iso downloaded from my school's ELMS)

 

Forgot to say, but this is a new drive just installed 1 week ago. Came with the latest firmware 000F

5 Replies
Kilobyte Kid

Re: Slow m4 512GB SSD when copying large files...

Also forgot to say, I partitioned my SSD into 2 drives, C: and D: 

 

Both partitions are aligned... 

Partition Disk #0, Partition #0
Partition Size 100.00 MB (104,857,600 bytes)
Partition Starting Offset 1,048,576 bytes
Partition Disk #0, Partition #1
Partition Size 251.73 GB (270,297,726,976 bytes)
Partition Starting Offset 105,906,176 bytes
Partition Disk #0, Partition #2
Partition Size 225.10 GB (241,704,108,032 bytes)
Partition Starting Offset 270,403,633,152 bytes
 
But the read and write speeds vary like crazy on the 2 drives... Any idea what's going on?
 
as-ssd-bench ATA M4-CT512M4SS C.png
 
as-ssd-bench ATA M4-CT512M4SS.png
JEDEC Jedi

Re: Slow m4 512GB SSD when copying large files...

Turn off drive compression on the D drive. Smiley Happy

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Kilobyte Kid

Re: Slow m4 512GB SSD when copying large files...

Ahhh.. Ok would try that.. I seriously don't remember drive compression giving such a big impact to the write speeds before.. 

Kilobyte Kid

Re: Slow m4 512GB SSD when copying large files...

But is the read speeds really so fast? Or is it an illusion?

JEDEC Jedi

Re: Slow m4 512GB SSD when copying large files...

I don't really know.  The results are odd because AS SSD uses incompressible data.  It shouldn't be affected by drive compression - but it does seem to be drastically whenever anyone uses it.  So I would guess it is an illusion that the differnce is that drastic.

 

But the idea shown in the benchmark is right.  Writes will be slower, reads will be faster BUT both tasks will require more CPU time so its not as simple as thinking 'well, I prefer my reads faster anyway'

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