@1tb

i was wondering what's so special about 300GB as ive got a 500GB 2.5" esternal sat here...

the difference is:

500GB / 5400rpm / sata / not rated for 24/7/365 use

300GB / 10000RPM / sas / rated for 24/7/365 use

the extra platter used in 500GB sata disks generally rules out 10Krpm use becuse of the extra air firction caused bu the second platter which means more power used and even more heat to try and shift : just look at the 300GB WD raptor for a good example of this: 2.5" dual platter 10KRPM mounted into a huge heatsink that transforms it into a 3.5" drive just to try and keep it cool...