Hi,
Normally you can upgrade to a new hard disk to the next bigger size, so from 40 Gb, then perhaps a 60 or even an 80 would work. Even if the BIOS/motherboard would not recognized the new size, Windows XP would and be able to access it.
However, I don't think that the size should really be the main concern. I think that your selection should be based primarily on the power consumption. Most laptops have a preset power distributed to its devices. If you are going to use a bigger size HD with a bigger power consumption, Windows (or even your BIOS) might recognize it but the power distribution might be over worked.
My suggestion would then be go to the next size but keep in mind the power rating/consumption of the old when selecting.
I am enclosing an image of my laptop's HD. Pls note the rating DC+5V 0.7A for this 60Gb HD. The 0.7A is its current consumption/rating.
Hope that this be of some help/idea. Pls post back how things worked out or should you need additional information.
Good luck and kind regards.
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