Ultra ATA is an IDE interface, and will work fine in your computer. IDE means Integrated Device Electronics (if I remember correctly) and means that the hard drive contains it's own buffer memory and geometry translation electronics. Ultra ATA means that it can transfer data at a rate in excess of 66 MB/s.
There is some common confusion about the terms IDE, SCSI, ATA and SATA. IDE indicates that the drive contains it's own operating electronics and that it tells the BIOS and motherboard IDE controller that it does it's own translation of instructions.
SCSI is a (generally) high speed, high quality, mission critical drive specification. SCSI devices can be daisy wired in series, I think up to 27 devices, including hard disks, scanners, and other cards and devices.
ATA is the common designation for the typical hard disks used for the last umpteen years, and refers to a parallel connection system. The correct designation is actually P-ATA.
SATA means Serial ATA, as opposed to parallel. SATA is the new standard and is rapidly replacing P-ATA drives in most new computers. SATA drives require special chipsets and connectors on the motherboard, or an adapter card. You probably don't want one of these unless your manual specifies it.
If you buy a hard drive that is too large to be recognized in full by the BIOS, install it anyway. Then go to Dell and download the newest BIOS and flash utility, read the instructions, burn the BIOS to a floppy (if your computer uses floppies), or follow the instructions provided and update your BIOS. Do not allow the power to go off during a BIOS upgrade. Buy a battery backup before you start this operation, if you don't already own one.
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Bob "Wiz" Feinberg
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<font size="1" color="#8e236b"><p align="center">[This message was edited by Wiz Feinberg on 16 April 2006 at 09:39 AM.]</p></FONT><font size="1" color="#8e236b"><p align="center">[This message was edited by Wiz Feinberg on 16 April 2006 at 09:41 AM.]</p></FONT>