Ultra DMA Mode 5, ATA-6 and Ultra ATA/100 all mean the same.  I have a comparison of these labels on my web site
http://www.bay-wolf.com/harddrive.htm#19

It certainly would be nice if they all used the same nomenclature.

Thanks Bay -  I've been to your Website, and  Ilike it. Nice job, I'm sure there are many who appreciate your efforts and knowledge.

Speaking of Your Knowledge, since DELL has failed tro answer my questions. I am a bit hesitant to spend $105.00 on a new seagate momentus 5400 rpm (ATA-6) (ATA/100) Drive, because I am worried that if I put in the new Drive, it will only run at the same Ultra DMA Mode 2 that my present Drive runs at.  one Dell Tech told me that my present Fujitsu Drive is ATA-5.

So, my question is : So you know if a newer, higher ATA Drive will run a higher Ultra DMA Mode ?

Is the Drive in the 1100 limited by the motherboard somehow. ?  I sure can't change anything in the BIOS. The 1100's BIOS isn't anything like aDell 4600 PC BIOS.

I think  I may chicken out of the new hard Drive project, and put a 512mb strick of ram in for $60.00,  'cause 1). I'm cheap. and 2). I'd have to do a complete re-install of EVERYTHING. One thing  I am going to do is buy another copy of Acronis True Image 8. I've got TI 8 on my main PC, and in 10 minutes if need be, I can wipe a drive and re-install a fresh backup of everything on my drive. No more Back Breaking 13 hour install of the OS ( i've got Broadband ), Norton Updates, Windows Updates, a 100 programs & Utilities & Drivers, plus the network , plus the Fred Langa Set up your Computer Tips, etc.

That's what you get if you are too frugal. 13 hours vs 10 to 15 minutes. I found out the other day, that I can get True Image 8 for $32.50 thru newegg. No further excuses now.