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USB powered devices

Message #1 - Posted 2005/02/01 - James Dore

An actual mac question, instead of Triumph goodness!

Our dean has just been in with a USB powered Zip250 drive. It's causing his OS 9.mumble-based powerbook to fall over on startup. I plugged it in to the 10.3.7 iMac I have, and it complained about the USB bus not having enough power and shutting down.

Are there certain flavours of OS 9 that handle this better? Can it be overcome by the powerbook, or does it require a powered USB hub (where it works fine on whatever OS version)?

Cheers,

James Dore,
IT Officer,
New College
james.dore@new / it-support@new

Message #2 - Posted 2005/02/01 - Jon B

James Dore wrote:

An actual mac question, instead of Triumph goodness!

Our dean has just been in with a USB powered Zip250 drive. It's causing his OS 9.mumble-based powerbook to fall over on startup. I plugged it in to the 10.3.7 iMac I have, and it complained about the USB bus not having enough power and shutting down.

Are there certain flavours of OS 9 that handle this better? Can it be overcome by the powerbook, or does it require a powered USB hub (where it works fine on whatever OS version)?

Was you plugging into the keyboard or directly into the mac, the usb ports on the keyboard have hardly enough power to drive a small floppy never mind a zip drive, normally they'll work fine when plugged into the side of the mac itself. Never had a bother with 9.0.4-9.2.2 until the drive itself failed.

Jon B
real email to usenet at jonbradbury dot com

Message #3 - Posted 2005/02/02 - James Dore

Previously, sniffthat@ohglobbits.tk says...

James Dore wrote:

An actual mac question, instead of Triumph goodness!

Our dean has just been in with a USB powered Zip250 drive. It's causing his OS 9.mumble-based powerbook to fall over on startup. I plugged it in to the 10.3.7 iMac I have, and it complained about the USB bus not having enough power and shutting down.

Are there certain flavours of OS 9 that handle this better? Can it be overcome by the powerbook, or does it require a powered USB hub (where it works fine on whatever OS version)?

Was you plugging into the keyboard or directly into the mac, the usb ports on the keyboard have hardly enough power to drive a small floppy never mind a zip drive, normally they'll work fine when plugged into the side of the mac itself. Never had a bother with 9.0.4-9.2.2 until the drive itself failed.

Into the mac. It's a Powerbook, running on mains I might add.

James Dore,
IT Officer,
New College
james.dore@new / it-support@new

Message #4 - Posted 2005/02/02 - Jon B

James Dore wrote:

Previously, sniffthat@ohglobbits.tk says...

James Dore wrote:

An actual mac question, instead of Triumph goodness!

Our dean has just been in with a USB powered Zip250 drive. It's causing his OS 9.mumble-based powerbook to fall over on startup. I plugged it in to the 10.3.7 iMac I have, and it complained about the USB bus not having enough power and shutting down.

Are there certain flavours of OS 9 that handle this better? Can it be overcome by the powerbook, or does it require a powered USB hub (where it works fine on whatever OS version)?

Was you plugging into the keyboard or directly into the mac, the usb ports on the keyboard have hardly enough power to drive a small floppy never mind a zip drive, normally they'll work fine when plugged into the side of the mac itself. Never had a bother with 9.0.4-9.2.2 until the drive itself failed.

Into the mac. It's a Powerbook, running on mains I might add.

Did the zip drive work before? I'm suspecting it may be faulty, presumably it did work at some point? When you plugged it in to the iMac was that into the back or the keyboard? If it was the back of the mac and it didn't work, then you've proved it doesn't work on either 10.3 or 9.x so I'd start looking at the zip drive as the problem --
Jon B
real email to usenet at jonbradbury dot com

Message #5 - Posted 2005/02/02 - James Dore

Previously, sniffthat@ohglobbits.tk says...

Into the mac. It's a Powerbook, running on mains I might add.

Did the zip drive work before? I'm suspecting it may be faulty, presumably it did work at some point? When you plugged it in to the iMac was that into the back or the keyboard? If it was the back of the mac and it didn't work, then you've proved it doesn't work on either 10.3 or 9.x so I'd start looking at the zip drive as the problem

Yes, it works fine on a powered USB hub, so I assume the Mac's own USB power is inadequate. It jus seems to take the whole mac down with prejudice, rather than just switching off the USB socket.

cheers,

James Dore,
IT Officer,
New College
james.dore@new / it-support@new

Message #6 - Posted 2005/02/02 - James Dore

Previously, arthursstuffforsale@yahoo.co.uk says...

James Dore wrote:

Our dean has just been in with a USB powered Zip250 drive. It's causing his OS 9.mumble-based powerbook to fall over on startup. I plugged it in to the 10.3.7 iMac I have, and it complained about the USB bus not having enough power and shutting down.

I had an external USB 2.5" HDD that took too much power for the usb port on my 12" powerbook. The problem was intermittent - understandably the drive seemed to take most power on start up, so if it passed that hurdle it usually worked ok.

I found a cable with 2 USB plugs at the powerbook end, one of which just took additional power from a second USB port and the drive worked ok.

Ah, cunning. I'll have a look for this - do you have any pointers for suppliers?

James Dore,
IT Officer,
New College
james.dore@new / it-support@new

Message #7 - Posted 2005/02/02 - Arthur

James Dore wrote:

Our dean has just been in with a USB powered Zip250 drive. It's causing his OS 9.mumble-based powerbook to fall over on startup. I plugged it in to the 10.3.7 iMac I have, and it complained about the USB bus not having enough power and shutting down.

I had an external USB 2.5" HDD that took too much power for the usb port on my 12" powerbook. The problem was intermittent - understandably the drive seemed to take most power on start up, so if it passed that hurdle it usually worked ok.

I found a cable with 2 USB plugs at the powerbook end, one of which just took additional power from a second USB port and the drive worked ok.

Arthur

Message #8 - Posted 2005/02/02 - Arthur

James Dore wrote:

arthursstuffforsale@yahoo.co.uk says...

I found a cable with 2 USB plugs at the powerbook end, one of which just took additional power from a second USB port and the drive worked ok.

Ah, cunning. I'll have a look for this - do you have any pointers for suppliers?

Sorry but I think it was bundled with some other USB device. Arthur

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