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USB Hard Drive not mounting til after restart

2015-10-11   Views:4

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This weekend I put a new internal hdd in my Power Mac G5, and decided to use this opportunity to go ahead and put Leopard on one of my macs. I'm finding that it doesn't mount some my USB External Hard Drives (3.5" externaly powered cases) unless I pl

This weekend I put a new internal hdd in my Power Mac G5, and decided to use this opportunity to go ahead and put Leopard on one of my macs.
I'm finding that it doesn't mount some my USB External Hard Drives (3.5" externaly powered cases) unless I plug them in, and then restart the computer. (It also works just starting up if the G5 is off.) The drive needs to be turned on before the start up.
This is the case with an older IDE->USB 5 inch case, a brand new sata->USB 3.5 case (with the former g5 drive inside, and a sata->usb newertech bridge on the g5 drive. A bus powered 2.5" one mounted fine without the restart. I have not tried any flash drives.
I've tried the different USB ports on the G5 with no difference. I have not tried plugging it into a hub that's pre-connected (either powered or non).
They don't show up in Disk Utility during the time they don't mount. They do after the plugged-in restart, though. They also unmount then remount fine after the plugged in-restart.
The drives work just fine on my MBP (running Tiger). They worked just fine before the Leopard upgrade. If I boot into the Tiger partition on the G5, they work just fine.
I've seen references to other people having what sounds sort of like this problem in google searches but nothing exact, and those threads seem to get sidetracked with useless comments (like "Well, you should just use Firewire!" etc).
Has anyone experience this...and moreover, anyone found a fix.

The replay answer
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Two things to check:
The drive must be formatted in Mac OS Extended (Journaled) or FAT 32
You almost always have to use a powered USB hub with the under powered port on the Time Capsule, even if the hard drive has its own power supply
Where are you expecting the drive to "show up"?

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