[9fans] WD hard disk not available in partdisk

[John DeGood <nu3e@arrl.net>]

I tried to install 4th Edition on an old Western Digital AC2340 340 MB hard
drive.  The hard drive is recognized by the BIOS and works with DOS and
Win95, but it does not appear in "partdisk" during the Plan 9 install.  I
also tried an old Seagate ST3243A 214 MB hard drive and "partdisk"
recognizes it fine.  I tried all master/slave combinations of the AC2340 and
ST3243A, and in every case only the ST3243A is available in "partdisk".

Here are snippets of what I get with the ST3243A as primary master and the
AC2340 as primary slave.  In every case the AC2340 appears to be recognized
early in the boot process, but it is never available in "partdisk":
----
  dev A0 port 1F0 config 045A capabilities 0000 mwdma 0000 dma 00000000 rwm
8
  dev B0 port 1F0 config 427A capabilities 0100 mwdma 0000 dma 00000000 rwm
16
  dev A0 port 170 config 8580 capabilities 0B00 mwdma 0003 dma 00000000 rwm
0
----
  The following disk devices were found.

  sdC0 - ST3243A
  * p1     0     1023  (1023 cylinders, 203.80 MB) FATHUGE
   empty  1023  1024  (1 cylinders, 204.00 KB)

  sdD0 - NEC CD-ROM DRIVE: 2523.18
----
This system has an old Intel Plato (aka Premier/PCI II) motherboard (Pentium
90 w/ 430NX chipset).

I also tried a 3rd Edition 9disk.9fd and had the same problem.

Am I doing something dumb or is this a bug/feature? :-)

John