What do Ultra DMA 5 & Ultra DMA 4 mean?

[otheos]

UDMA5 = 100MB/s
UDMA4 = 66MB/s

[Isos]

When the computer boot up, the new Maxtor ATA-100 controller will detect the drives that are connected and display one as having Ultra DMA 5 and the other Ultra DMA 4. Are these related to ATA-100 & ATA-66?

[otheos]

Confusing?....

in linux when you specify the transfer protocol of your IDE drive, you give:

hdparm -xXX

where XX is
66 for UDMA33
68 for UDMA66

How's that for confusion?

[Win_98]

That confusing I prefer dma33/dma66/dma100 over dma 4,5,6 etc.