On Mon, 21 Feb 2000 00:58:04 -0700 (MST) 
 Miles Nordin <carton@Ivy.NET> wrote:

 > On Sun, 20 Feb 2000, Chris Tribo wrote:
 > 
 > > ATAPI is an earlier (slower) version of today's IDE, correctly called EIDE.

That's not precisely true...

ATAPI is actually a command protocol on top of ATA ... it encapsulates
what are essentially SCSI commands over an ATA transport.

 > The speed progression of IDE is
 >  PIO
 >  DMA
 >  Ultra33-DMA
 >  Ultra66-DMA
 > 
 > The ``Ultra'' modes require the more expensive thin-wire ribbon cables
 > like the Macs ship with, and they also do CRC's on each transfer so if
 > your cabling is inadequate you'll get errors printed on the console,
 > rather than the data corruption that you get with PIO or DMA mode and
 > crappy cables.

...Ultra66 is actually an LVD-like thing... just as an aside :-)

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>