running xp chkdsk on a win 7 hdd

[duttyfoot]

My friend has a dual boot hdd with both win 7 and win xp on it. while booting to win 7 the hard drive fails and reboots. I have a win xp system so I hooked the hard drive to a sata port on my mobo and during the boot process my xp machine started running chkdsk.

I didn't stop it and now wonder if i should have. If he has win 7 on a hdd was it a good idea to let my win xp machine do a chkdsk and fix the problems it found. I noticed that during the chkdsk it was fixing orphaned files and before that it said something about an index $I30.

When the chkdsk was done and my pc booted into xp i could see his drive but it didn't show a size. in the disk management area it showed the size of his drive but in my computer it shows only the size for my hdd. if i click on his drive the machine slows down.

Was running chkdsk from a xp machine on a win 7 hard drive a bad move on my part? he was able to boot into the xp partition of his hdd so he could transfer some important files he was working on and some of them are coming up as being corrupt. could the xp chkdsk cause this?

Is it possible if chkdsk was done from another win 7 machine some of his files wouldn't be corrupt and his hdd would be showing the size in my computer.