Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I used Acronis Disk Director to do a direct clone of my C:\ windows 7 x64 drive from my Vertex 2 to my new Vertex 3 SSD (Just to show the drive software winstall everything is identical.)

I ran a performance test on Windows using the Windows Experience Index. The rating I am receiving when booting on the Vertex 2 is 7.5 While I am getting only a rating for the Vertex 3 of 6.9 My understanding is that the read/write speeds of the Vertex 2 is only up to 250MB/sec while the Vertex 3 is up to 500MB/sec.

Copying a single file (3GB in size) from the Vertex 3 to itself was getting speed of approx 70-80MB/sec This speed is no better (maybe worse) than what I got from the Vertex 2 I am connected via the SATA 3 port on the motherboard, using an SATA 3 cable

Is this issue caused by the drive cloning? Do I have a bad SSD?

share|improve this question
You should run some benchmarks with utilities that will give you more detailed information then windows and report those results to help us figure out what is wrong. – Eric Fode Apr 12 '12 at 4:40
What are the sizes of the two drives? How much data did you clone? – David Schwartz Apr 12 '12 at 4:44
Both drives are 120GB and both have ~8 GB free - what benchmark prog are free and available for testing SSD drives? – Kairan Apr 12 '12 at 5:47
Full drives are slow. Probably the old drive was a bit better optimized as Windows optimizes drives as they are used and the clone process was likely file by file in essentially random order. – David Schwartz Apr 12 '12 at 7:31
up vote 2 down vote accepted

SandForce based SSDs have a optional feature called Lifetime Throttling. It will monitor the rate (PE cycles/Power on Time) at which the SSD is wearing out and if it seems they will run out before a specified warranty period it will throttle the write speed.

This is something OCZ has implemented in its SandForce based drives.

This means that if you take a brand new drive, and write a lot of data to it immediately, like you would do if you clone a big partition to it, the Lifetime Throttling will engage. As far as I know there is no way to disable this. But if you leave the drive powered on for a long stretch of time without writing to it, that will even out the wear rate and Lifetime Throttling will disengage.

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .