Thank you Macius,

I have to be a little careful here as apparantly under the warranty, only an authorised Service Centre can change the HDD or it will invalidate my warranty.

I will see what I can find out further and I will update this post when I have a yes or a no answer.

Thanks again

Well done some trying, with no sucess.

Rang Toshiba Technical Support and while they could not confirm that the constallaton.2 1 TB 2.5 inch HDD would work with the Qosmio X500, They did confirm that the Qosmio wouldwork with a 1 TB HDD. So there is no restriction via BIOS.

So back to searching.

Ine site had the answer, the Constallation.2 is apparantly an "enterprise" level HDD, and will not work in most laptops because:
1. It has a 12V power requirement where as mose laptops only supply 5 V to the HDD (or so it is claimed).
2. The Dive is bigger that the space generally allowed. which is said to cause a number of problem including strain on the case & heat disappation.

That these limitation rule out most laptops even thouse only a few yesrs old, you would wonder why retailer would market it as a laptop HDD?

Still, the Constallation.2 is going back to the shop and will be swapped for a Western Digital or even the Toshiba 1 Tb version.

Sorry,

I though my last post above was clear, so I have not been back for a while. The problem was not that the Toshiba could not handle a 1TB HDD, it can. Its just thet the Seagate Constallation 2 HDD while marketed by some people as a laptop drive, it is actually an enterprise HDD and intended for servers, not laptops.

Its power requirements are 12V as opposed to what a laptop can provide of 5V. Hence the =constallation HDD would not power up, hence could not be recognised by BIOS.

I have subsequently bought a WD 1 TB HDD, which worked without a problem.