partitions not found on win7 but there on xp?

[adwb]

I have hdd that was installed on a win7 home machine. i had a message saying fault and explorer closed and two partitions out of three on a 1trb drive are shown now as not available.
I put the drive in a caddy and connected to a old laptop running xp and there I can see the partitions and the contents but not when plugged into the usb on the win 7 machine.
any ideas why this is? and is it fixable?

 

[cyanna]

try a different usb port on the Windows 7 machine, preferably one at the other end of the computer (back posr if you have previously used front)

 

[gregrocker]

Back up your files from the XP machine which can read the drive.

Then run a full Disk Check.