Alan,
Thanks for writing. Your point about the sectors is interesting, especially since as you can see below the FAT claims to have made 512000 sectors.
mkdosfs 2.10 (22 Sep 2003) /dev/sda has 9 heads and 56 sectors per track, logical sector size is 512, using 0xf8 media descriptor, with 512000 sectors; file system has 2 16-bit FATs and 8 sectors per cluster. FAT size is 250 sectors, and provides 63933 clusters. Root directory contains 512 slots. Volume ID is 416fdcd5, no volume label.
You got that just backward. mkdosfs _always_ writes over the boot sector. After all, you can hardly have a valid FAT filesystem without a good boot
sector!
Urk. I was thinking about mkdosfs and that it will never create a bootable disk...
OK, time for some logs. I'm leaving in the timestamps in case that's an issue.
after "modprobe usb-storage verbose" and plugging in the device
Oct 15 12:47:59 bagpipes kernel: hub.c: new USB device 00:10.3-3, assigned address 37
Oct 15 12:47:59 bagpipes kernel: scsi1 : SCSI emulation for USB Mass Storage devices
Oct 15 12:47:59 bagpipes kernel: Vendor: iriver Model: MassStorage Disc Rev:
Oct 15 12:47:59 bagpipes kernel: Type: Direct-Access ANSI SCSI revision: 02
Oct 15 12:47:59 bagpipes devfsd[106]: fixscsigenericperms(scsi/host1/bus0/target0/lun0/generic)
Oct 15 12:47:59 bagpipes devfsd[106]: Changed non-CD scsi/host1/bus0/target0/lun0/generic to be 0/0 0600
Oct 15 12:47:59 bagpipes kernel: Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
Oct 15 12:47:59 bagpipes kernel: SCSI device sda: 512001 512-byte hdwr sectors (262 MB)
Oct 15 12:47:59 bagpipes kernel: sda: Write Protect is off
Oct 15 12:47:59 bagpipes kernel: /dev/scsi/host1/bus0/target0/lun0: p1
Oct 15 12:47:59 bagpipes kernel: WARNING: USB Mass Storage data integrity not assured
Oct 15 12:47:59 bagpipes kernel: USB Mass Storage device found at 37
Oct 15 12:48:02 bagpipes usb.agent[32193]: usb-storage: loaded successfully
unplug and replug the device:
Oct 15 12:49:43 bagpipes kernel: usb.c: USB disconnect on device 00:10.3-3 address 37
Oct 15 12:49:48 bagpipes kernel: hub.c: new USB device 00:10.3-3, assigned address 38
Oct 15 12:49:48 bagpipes kernel: WARNING: USB Mass Storage data integrity not assured
Oct 15 12:49:48 bagpipes kernel: USB Mass Storage device found at 38
Oct 15 12:49:52 bagpipes usb.agent[32271]: usb-storage: loaded successfully
Attempt to mount again:
Oct 15 12:50:55 bagpipes kernel: SCSI disk error : host 1 channel 0 id 0 lun 0 return code = 70000 Oct 15 12:50:55 bagpipes kernel: I/O error: dev 08:00, sector 0 Oct 15 12:50:55 bagpipes kernel: FAT: unable to read boot sector
I tried to use cfdisk to create a disk partition on the USB, formatted with FAT16. That gives me an /dev/sda1 file system, but when I try to mount it I get the same problem:
Oct 15 12:52:15 bagpipes kernel: SCSI disk error : host 1 channel 0 id 0 lun 0 return code = 70000
Oct 15 12:52:15 bagpipes kernel: I/O error: dev 08:01, sector 0
Oct 15 12:52:15 bagpipes kernel: FAT: unable to read boot sector
Finally, dosfsck gives a funny result that's not consistent with the odd-number-of-sectors problem. First I made certain I was using a clean system by reformatting:
# mkdosfs -v -F 16 -I /dev/sda mkdosfs 2.10 (22 Sep 2003) /dev/sda has 9 heads and 56 sectors per track, logical sector size is 512, using 0xf8 media descriptor, with 512000 sectors; file system has 2 16-bit FATs and 8 sectors per cluster. FAT size is 250 sectors, and provides 63933 clusters. Root directory contains 512 slots. Volume ID is 417012cf, no volume label.
syslog shows:
kernel: SCSI device sda: 512001 512-byte hdwr sectors (262 MB) kernel: sda: Write Protect is off kernel: /dev/scsi/host1/bus0/target0/lun0:
I then tried dosfsck:
# dosfsck -v /dev/sda
dosfsck 2.10 (22 Sep 2003)
dosfsck 2.10, 22 Sep 2003, FAT32, LFN
Checking we can access the last sector of the filesystem
Boot sector contents:
System ID "mkdosfs"
Media byte 0xf8 (hard disk)
512 bytes per logical sector
4096 bytes per cluster
1 reserved sector
First FAT starts at byte 512 (sector 1)
2 FATs, 16 bit entries
128000 bytes per FAT (= 250 sectors)
Root directory starts at byte 256512 (sector 501)
512 root directory entries
Data area starts at byte 272896 (sector 533)
63933 data clusters (261869568 bytes)
56 sectors/track, 9 heads
0 hidden sectors
512000 sectors total
Checking for unused clusters.
/dev/sda: 0 files, 0/63933 clustersSo dosfsck shows 512000, not 512001 sectors.
If you've any suggestions, please let me know!
Regards, Moshe
P.S. I will be offline from about 5 PM CT (10 PM Zulu) until Sat. night, so I won't respond to email during those timeframes.
-- Moshe Yudkowsky * [EMAIL PROTECTED] * www.pobox.com/~moshe "Come on, you sons of bitches! Do you want to live forever?" Gunnery Sergeant Dan Daly, U.S.M.C., Belleau Wood, June 6, 1918
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