I've installed this in a Dell Dimension 3100 along with a new copy of W7
and a new Radeon graphics card
as an upgrade from the old 320GB drive, XP and the old MB graphics.
It is significantly faster in use than the original drive, and has about the same acceptably low level of acoustic noise. At a claimed 150MBytes/s host to/from drive (sustained) data transfer rate this WD10EZRX is the fastest of all the current WD Green drives even if not the biggest. The rotational speed is chosen using the IntelliPower algorithm to maximise transfer rate in all parts of the disk while minimising errors.
It fitted into the original 'clip-in' drive caddy with no problems, and plugged into the machine as normal.
The drive initialised and formatted correctly under the control of the W7 DVD and tested out OK with no errors. It runs cooler to the touch than the original did.
I've restored all the previous data from the backup
, and now keep the old drive untouched in the packing the WD came in as an emergency spare with XP and all the old software and data 'just in case'.
It is still looking good after almost a fortnight in service. I'll report if there are any problems, but based on previous experience with these I expect it should be OK for a few years now.
Addendum. 13th October 2013
Added another of these to the same computer because the first one has proved to be excellent. This is for more flexibility with the editing so that all the big data files are kept on a separate D: work drive with its own distinct external mirror back up, thus leaving the C: drive with all the system files and programs relatively unstressed for longest life.