I'm helping a friend replace a failing drive in their Dell Dimension 8300, speccy shows the current drive as: 78GB IC35L090AVV207-0 (PATA)
Would the following drive be compatible:
Hope someone can help
Yes, that will work fine! The only thing you need to remember is to set the drive jumper to cable select before you install it.
The jumper pins are on the hard drive, next to the power connector and the various settings to use, should be listed on the label attached to the hard drive.
Cable Select, is usually noted as CS, or CSEL.
The information HERE, may also help.