I'm trying to use a zip disk, but any access results in a stream
of errors:

pciide0:1:1: piomode error (0x4)
sd0(pciide0:1:1): ATA command aborted
pciide0:1:1: piomode error (0x4)
sd0(pciide0:1:1): ATA command aborted
pciide0:1:1: piomode error (0x4)
sd0(pciide0:1:1): ATA command aborted
pciide0:1:1: piomode error (0x4)
sd0(pciide0:1:1): ATA command aborted
pciide0:1:1: piomode error (0x4)
sd0(pciide0:1:1): ATA command aborted
.
.
.

I'm using the 5/27 snapshot.  Using a custom kernel now, but had the
same
problem with the generic kernel.

Any ideas?

Thanks,

  -Jeff

Relevant bits from dmesg:

NetBSD 1.4Z (MINESWEEPER) #4: Wed May 31 14:18:58 EDT 2000
   
jmcm@minesweeper.frc.ri.cmu.edu:/usr/src/sys/arch/i386/compile/MINESWEEPER
cpu0: family 6 model 5 step 2
cpu0: Intel Pentium II (Deschutes) (686-class)
total memory = 97856 KB
avail memory = 87424 KB
using 1248 buffers containing 4992 KB of memory
BIOS32 rev. 0 found at 0xfd7a0
mainbus0 (root)
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82443BX Host Bridge/Controller (rev. 0x03)
ppb0 at pci0 dev 1 function 0: Intel 82443BX AGP Interface (rev. 0x03)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
vga1 at pci1 dev 0 function 0: Nvidia Corporation RIVA TNT (rev. 0x04)
wsdisplay0 at vga1: console (80x25, vt100 emulation)
pcib0 at pci0 dev 7 function 0
pcib0: Intel 82371AB PCI-to-ISA Bridge (PIIX4) (rev. 0x02)
pciide0 at pci0 dev 7 function 1: Intel 82371AB IDE controller (PIIX4)
(rev. 0x01)
pciide0: bus-master DMA support present
pciide0: primary channel wired to compatibility mode
wd0 at pciide0 channel 0 drive 0: <WDC AC28400R>
wd0: drive supports 16-sector pio transfers, lba addressing
wd0: 8063 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 16514064
sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4
pciide0: primary channel interrupting at irq 14
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data
transfers)
pciide0: secondary channel wired to compatibility mode
atapibus0 at pciide0 channel 1
cd0 at atapibus0 drive 0: <CD-532E-B, , 1.0B> type 5 cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2
sd0 at atapibus0 drive 1: <IOMEGA  ZIP 100       ATAPI, , 12.A> type 0
direct removable
sd0: drive offline
sd0: 32-bit data port
sd0: drive supports PIO mode 3
pciide0: secondary channel interrupting at irq 15
cd0(pciide0:1:0): using PIO mode 4, DMA mode 2 (using DMA data
transfers)
sd0(pciide0:1:1): using PIO mode 3