I'm running a 1.6ZG build from yesterday, though this problem's been
around for at least a month.

I have two USB clip drives, a 128 MB "Genuine":

    umass0: EasyDisk Flash Disk, rev 1.10/1.00, addr 4
    umass0: using SCSI over Bulk-Only
    scsibus0 at umass0: 2 targets, 1 lun per target
    sd1 at scsibus0 target 0 lun 0: <VTEC, USB FLASH DRIVE, 1.00> disk removable
    sd1: fabricating a geometry
    sd1: 125 MB, 125 cyl, 64 head, 32 sec, 512 bytes/sect x 256000 sectors

and a 256 MB Buffalo:

    umass0 at uhub4 port 2 configuration 1 interface 0
    umass0: USB Flash Disk, rev 1.10/1.10, addr 4
    umass0: using SCSI over Bulk-Only
    scsibus0 at umass0: 2 targets, 1 lun per target
    sd1 at scsibus0 target 0 lun 0: <BUFFALO, ClipDrive, 1.88> disk removable
    sd1: fabricating a geometry
    sd1: 250 MB, 250 cyl, 64 head, 32 sec, 512 bytes/sect x 512000 sectors

The 128 MB one works just fine. The 256 I can newfs, mount, and read and
write in a filesystem, but if I try to install boot blocks or even use
dd on a raw device, it just doesn't work:

    ironic $ dd if=/dev/rsd1d of=/dev/null count=128
    0+0 records in
    0+0 records out
    0 bytes transferred in 0.005 secs (0 bytes/sec)

    ironic $ dd if=/dev/rsd1a of=/dev/null count=128
    0+0 records in
    0+0 records out
    0 bytes transferred in 0.005 secs (0 bytes/sec)

(These commands work fine on the 128 MB drive.)

My securelevel is -1, so I don't think that's the problem. Anybody got
any idea what the heck is wrong?

cjs
-- 
Curt Sampson  <cjs@cynic.net>   +81 90 7737 2974   http://www.NetBSD.org
    Don't you know, in this new Dark Age, we're all light.  --XTC