HDD/SSD speed write/read

Subject: HDD/SSD speed write/read Wed May 01 2013, 13:52

I used CrystalDiskMark to see the write and read speed
of my HDD (1T) and my SSD (64 GB)
Link over here:
CrystalDiskMark

I don't know exactly what what is clubed

But the higher the better i think cool

Anyone can explain the reading like:
Seq, 512K, 4K, 4K QD32

My Result:
HDD:

SSD:

Guest

Seq is sequential reading
512k is the size of what it's reading.
4k is also the size of what it's reading. 4k is a smaller file.
4k qd32 means 4k 32 queue depth. There are 32 requests in line for 4k of data.

Your SSD shows better results which is to be expected.

Member Posts : 56 Join date : 2012-12-24

Never bothered to test an HDD before but I did benchmark my Samsung 840 SSD (256GiB) when I first installed it. Got numbers pretty much identical to those on the box:
Read 540MB/s (4KB Random 96K IOPS)
Write 250MB/s (4KB Random 62K IOPS)

As Celtic says, your 'seq' is sequential data while the 4K/512K are data blocks (of that size) randomly spread over the drive. Also, you might want to free up some space on your SSD if it is 94% full. I think a good rule of thumb for mechanical disks is to keep 10% free. For solid state drives you might want more to avoid excessive write amplification.

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