On 04/11/10 17:58, Chris G wrote:
On Thu, Nov 04, 2010 at 04:52:11PM +0000, Tim Green wrote:
Is there a jumper for XP compatibility mode? My WD 1Tb is like your first one with 255 heads, and the jumper is not set.
Yes, there is something about XP compatibility, I did what it said for 'other' operating systems, i.e. nothing. I don't know how the jumpers on the earlier disk are set, I doubt I've changed them either but I'm not sure, I built the system quite a while ago.
That sounds like it is to do with the new 4KB sector size and the fact that you have the jumper unset and your OS is still telling you that you have 512 byte sectors is maybe a worry as that might...I am not sure indicate that you have a kernel that is too old to understand 4KB sectors.
Or maybe WD have emulated 512byte sectors on top of the new 4KB sectors and the jumper just controls the offset. I'd read up if I were you :)
Don't set the jumper back now as I have a nasty feeling that will scramble the contents of your drive. But if you are running a kernel that doesn't understand 4KB sectors on a drive that is set to that mode then you get miss-alignment in the sector map which will be costing you a bit of performance.
As to the reported geometry differences, I wouldn't worry too much, particularly if the drives aren't the exact same model. Cylinder, Head Sector addressing is pretty meaningless (and emulated) nowadays. What kernel versions are you both on ?