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STX88810 STX Evaluation Platform Module
Series User’s Manual
Ultra DMA/66/100 Reference
67
Frequently Asked Questions
1. Can I run UDMA/66/100 on a 40 pin 40 conductor cable?
No, the UDMA/66/100 technology is defined such that the PC and
the HDD can both detect the presence of the 80-conductor cable.
UDMA/66/100 will not be enabled unless the 80-conductor cable
is present.
2. I have an UDMA/33 system today. How can I support UDMA/66/100?
An existing system can be upgraded by purchasing a PCI-EIDE
controller that supports UDMA/66/100.
3. Do Microsoft Operating Systems support UDMA?
Windows releases indicate that they all support DMA
transfers. Windows does not know the difference between
Ultra ATA/33 or Ultra ATA/66/100. Your HDD, your
controller and the BIOS determine UDMA data transfer rate.
This applies for all the following Windows operating
systems:
-
Windows 98
-
Windows NT Service Pack 3
-
Windows 95 OEM Service Release 2
4.
I don't have a system that supports Ultra ATA/66/100, can I run the
Ultra ATA/66/100 HDD in it?
Yes, the HDD will not run in UDMA/66/100 mode but instead is a
slower compatible mode such as Ultra ATA/33, DMA Mode 2 (16.6
MB/s) or PIO Mode 4 (16.6MB/s)
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