Thanks for the reply.
Just did a secure erase and read it. Fixed the problem, getting ~70mb writes again.
The drive was 2+ years old
I hope this secure erase thing is something to do yearly instead of monthly...reinstalling is not my hobby.
Also I think if a drive is starting to perform like this in a matter of months,
it should have been regarded as an bad product with a replacement program by Intel.
there are a few things you can do to help:
1) don't benchmark too often, since this will be writing to your freshly erased cells (!)
2) try to keep as much free space as possible to allow the inbuilt garbage collection to do its job
3) you don't need to reinstall as such - you can back up your partition with some system image software, secure erase, then restore it. You don't necessarily have to reinstall windows.
It looks like you are running Vista or windows 7, and the inbuilt back up utility in that is fairly decent. I know with windows 7 it is, and i think that's based off the Vista one. There are third-party utilities for this task, though i've found inbuilt does a decent job.