Hello.
Seems like 3.5' HD doesn't getting enough power from usb port. You may try to use two-headed usb adapter (which takes power from two usb ports) or plug an external power source to the enclosure (if available).

Hey, I'm using OpenBSD 4.1-STABLE and I just today purchased a 250GiG Western 
Digital drive and a cheap USB 2.0 enclosure..

I'm trying to setup the partitions on the device using an old Pentium 2 with a 
USB 1.0 controller, (usb0 at uhci0.)

Anyway, the device ""does"" show up when I plug it in.. but when I attempt to 
save any MBR changes it displays an error..

[Copy & Pasted]
umass0 at uhub0 port 1 configuration 1 interface 0
umass0: Super Top USB 2.0 IDE DEVICE, rev 2.00/2.01, addr 2
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets
sd0 at scsibus1 targ 1 lun 0: <WDC WD25, 00JB-55REA0, 0 0> SCSI 0/direct fixed
sd0: 238475MB, 238475 cyl, 64 head, 32 sec, 512 bytes/sec, 488397168 sec total
..

Anyway, here is what fdisk prints.. (No other recorded errors in dmesg..)
fdisk:*1> w
Writing MBR at offset 0.
fdisk:*1> q
Writing current MBR to disk.
fdisk: error writing MBR: Input/ouput error
fdisk:*1>
...

I thought the jumper might have been wrong, It didn't work when at CS(Cable 
Select) or Master (No Jumper..)

Did I buy a defective/unsupported device? or can anyone explain what I'm doing wrong....? It cost me a bit.... :(

Edit, I tried using the latest snapshot bsd.rd and the device is still 
detected.. but the same error occurs..

I know it's "trying" to write, each time I print q in the fdisk interface.. the 
disk status light flickers.. could the device just hate non-USB 2.0 controllers?

(Crap, It seems to work perfectly fine on a system running Windows 2000.. With 
a USB 2.0 controller.. *Sigh*)

Do I need a new enclosure?

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