I put a "SanDisk Extreme IV" CF card in my NET5501 and found that
it prevents SATA or PATA devices from running UDMA33 or higher.
The Extreme IV CF supports UDMA33 mode, possibly also UDMA66, but
the NET5501 does not support that in the CF socket.
Unfortunately, while UDMA33 works great with the CF card, it prevents
a SATA or PATA disk from using any UDMA modes.
The only way to get a working two-device system is to downgrade the
SATA/PATA device to WDMA2.
Downgrading the Extreme IV CF card to WDMA2 does not allow the
SATA/PATA device to run UDMA.
In other words:
CF SATA/PATA CF Works ? SATA/PATA works ?
---------------------------------------------------------
UDMA33 UDMA* Yes No
WDMA2 UDMA* Yes No
UDMA33 WDMA2 Yes yes
WDMA2 WDMA2 Yes yes
---------------------------------------------------------
The Extreme III CF supports "only" WDMA2 mode, and does not seem to
have any compatibility issues with SATA and PATA devices.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[EMAIL PROTECTED] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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