The hard drives are probably compatible. It depends on what the motherboard
and bios will recognize (look in your bios). Windows XP machines probably
accept up to 120GB hard drives without a problem. Older machines, maybe not.
I had a W98se HP Pavilion purchased in 1999 that would only recognize up to
a 60GB hard drive, a bios limitation. I got around it by installing an IDE
PCI adapter card. I currently have a Compaq Presario purchased last summer
with Windows XP which came with a 40GB hard drive. I put in 2 new drives, a
120GB and 80GB, and it works fine. The Recovery CDs also work OK after
replacing the original hard drive, which is probably usually the case, but
again might not be true of some older machines.
--
Euclid


wrote in message
...
I'd like to replace my 20GB HD with a new 80GB HD.....my question is: Are
all HD compatible?

thanks....