Udma 33/ Ata 66 ??

Hey,

OK.. I have a Really old machine, which had a UDMA hard drive in it, not sure what speed it was (66 etc.). The hard drive has gone and needs replacing, so i looked through the motherboard manual and it states: "Supports PIO mode 3,4 (UDMA 33/ATA66) IDE & ATAPI CD-ROM."

OK i know that Ultra ATA and UDMA are basically the same sort of thing, and the following links show this:

Micro Direct link for Maxtor Diamondmax Hard Drive

Dabs link for the same drive

The Microdirect link calls it an ATA133 drive and the Dabs link calls it a UDMA133 drive.

So why in my motherboard manual does the UDMA spec half that of the ATA spec?

Finally would the following drive work ok in my (old) machine:??? (not the machine in my signature!)

Seagate Barracuda from Scan

If I recall correctly - hard-drives if they cannot connect at their speed rating will auto-negociate with the system until they both agree on a speed that they can both run at.

What I would also check - either on the motherboard manufacturers webby is that the system might have a BIOS limitation that cannot see over a certain size.