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bootable disk: how?
Okay, I give up. What does it take to make a disk bootable?
I thought I knew. But either I'm wrong or the tools aren't doing what
I thought they were (and, if I'm reading things right, what they're
I've used fdisk -aui and answered y to the "update the bootcode"
prompt. I've used installboot to update the second-level bootlocks.
I've even tried disklabel -B (this started on a 3.0 system). Nothing
Most recently, I moved the disk to a 4.0 machine and used fdisk -aui
and installboot there. It *still* fails to find an OS. (The exact
message differs from system to system, depending on the BIOS; the 4.0
machine says "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER",
while the 3.0 machine says "Operating System not found". Of course, I
have to either unplug other disks or disable booting from them, or the
machine boots normally from wd0 (3.0) or sd0 (4.0).)
fdisk (4.0) shows
0: NetBSD (sysid 169)
start 63, size 8448237 (4125 MB, Cyls 0-525/224/63), Active
disklabel (4.0) says
# size offset fstype [fsize bsize cpg/sgs]
a: 8448237 63 4.2BSD 2048 16384 26296 # (Cyl. 0*- 8939)
c: 8448237 63 unused 0 0 # (Cyl. 0*- 8939)
d: 8448300 0 unused 0 0 # (Cyl. 0 - 8939)
The disk is (again, 4.0)
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
piixide0 at pci0 dev 7 function 1
piixide0: Intel 82371AB IDE controller (PIIX4) (rev. 0x01)
piixide0: bus-master DMA support present
piixide0: primary channel wired to compatibility mode
piixide0: primary channel interrupting at irq 14
atabus0 at piixide0 channel 0
wd0 at atabus0 drive 1: <FUJITSU MPD3043AT>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 4125 MB, 8940 cyl, 15 head, 63 sec, 512 bytes/sect x 8448300 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
wd0(piixide0:0:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
The disk works fine for non-boot purposes; the only symptom I have is
this inability to get the BIOS to boot from it.
I'd even welcome RTFM responses, provided they say which FM to R; I've
read through manpages over and over again, but of course am not immune
to missing things.
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