Only selling this drive as I ended up installing a SanDisk SSD.

http://www.crucial.com/store/partspecs. ... T256M4SSD2

Purchased brand new 3 weeks ago, unboxed but basically never used.

$180

Cheers - Nik

P.S. Long story here is that I tried installing the M4 into my MacBook Pro but I didn't realise which OS X install disc was the right one to use until I had installed the SanDisk... so I just ended up leaving the SanDisk in my laptop, absolutely nothing wrong with the M4.