External USB drive not recognized in OS X after rebooting from Boot Camp

Thanks in advance for any help. Here's the situation:
Everything works fine in OS X (10.5.2). In particular I have an external USB harddrive that I keep my iTunes songs on.
Then I boot via Boot Camp into Windows XP and play a few games. Then I reboot out of XP and back into OS X. At that point the external USB harddrive does not show up on the desktop. If I turn off the harddrive and turn it back on again, it shows up and is usable. I can continue to do that, but I would appreciate any advice on how to get the harddrive to show up when rebooting from XP (without requiring it to be turned off and on).
Thanks!

I've surfed around already before having my problem posted here because it's so frustrated…
AnaMusic: I've tried that but it isn't worked
Eric Ross: it's checked
LexSchellings: I did run "verify disk" and "repair disk" -> but no luck… My hard drive isn't mounted to Lion as shown in status. Is it something to do with NTFS format? I came across some forum and read that Lion is design to natively support NTFS..
Are there any ways around???

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Me too:
USB4500 FW1.04:
Version: 0.01
Bus Power (mA): 500
Speed: Up to 480 Mb/sec
Manufacturer: DATAST0R Technology Corp
Product ID: 0x4500
Serial Number: 1966051022645658
Vendor ID: 0xed06
System profiler sees it, Virtual PC sees it in the USB settings, but it does not work in Windows on VPC.
USB prober sees it:
High Speed device @ 5 (0x5B300000): ...... Composite device: "USB4500 FW1.04"
Device Descriptor
Descriptor Version Number: 0x0200
Device Class: 0 (Composite)
Device Subclass: 0
Device Protocol: 0
Device MaxPacketSize: 64
Device VendorID/ProductID: 0xED06/0x4500 (unknown vendor)
Device Version Number: 0x0001
Number of Configurations: 1
Manufacturer String: 16 "DATAST0R Technology Corp"
Product String: 32 "USB4500 FW1.04"
Serial Number String: 48 "1966051022645658"
Configuration Descriptor: ................................."1966051022645658"
Length (and contents): 32
Number of Interfaces: 1
Configuration Value: 1
Attributes: 0xC0 (self-powered)
MaxPower: 98 ma
Interface #0 - Mass Storage/SCSI
Device Qualifier Descriptor
Descriptor Version Number: 0x0200
Device Class 0 (Composite)
Device Subclass 0
Device Protocol 0
Device MaxPacketSize: 64
Number of Configurations: 1
bReserved: 0
Other Speed Configuration Descriptor: ....................."1966051022645658"
Length (and contents): 32
Number of Interfaces: 1
Configuration Value: 1
Attributes: 0xC0 (self-powered)
MaxPower: 98 ma
Interface #0 - Mass Storage/SCSI
... but USB Prober gets this same error over and over:
314.289 [1] AppleUSBEHCI[0x1f05800]::Found a transaction past the completion deadline on bus 0x5b, timing out! (Addr: 5, EP: 2)
314.289 [1] AppleUSBEHCI[0x1f05800]::Found a transaction past the completion deadline on bus 0x5b, timing out! (Addr: 5, EP: 2)
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External firewire drive not recognized when re-attached after being ejected

I'm using a Seagate external drive for Time Machine backups. When I need to disconnect the drive from the Macbook's firewire port, I drag the drive icon to the trash/eject icon. When the drive icon disappears from the desktop, I unplug the cable. If I plug the drive in again, the drive responds by lighting up and spinning up, but the icon for the drive never appears on the desktop or in the Finder window. Time Machine doesn't run as scheduled because it doesn't know the drive is attached. If I briefly power down the drive before plugging in its cable, the Mac recognizes the drive and it can be used by Time Machine. Is there a different procedure for unmounting the drive that would eliminate the need to power it off before reconnecting?

Thanks for the reply. The drive is mounted properly when I follow your procedure, same as it was when I powered down the drive. Your procedure differs from what I described in that the drive is powered down before the cable is unplugged. Maybe that's the safest approach. But I was looking for a way to avoid powering down the external drive since that involves unplugging the power connector (i.e., there is no power switch). Any way to avoid the power down?

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Hi, I have my router (WRTSL54GS) set up and seems to be working ok, but the computer does not recognize it in my network. It only recognizes it as a wireless connection. Also, the USB hard drive I have attached to the router is not recognized anywhere on my computer. What am I doing wrong? Any help would be appreciated!

hi - thanks for responding! I have comcast and have their modem. I hooked up the router with my laptop and went through the setup fine. Everything with that works ok. The USB drive is recognized on the web based utility program that you use to set up the router. However, no where on my computer can I find the USB drive or where to even set up that driver. The manual says that my router should be listed as a another computer in my network neighborhood and that I should be able to find the hard drive through that. It is not. Its only listed in my wireless connections. I talked to a rep at linksys for awhile. In the end, they just suggested unplugging it and plugging it back in......that didn't work! Does that help?

Toshiba External Hard Drive not recognized by computer. Please help!

I was wondering if anyone could help me. I have an external hard drive and it will not show up in "My computer" when I plug it in. I have tried other USB drives and other computers. I am starting to think it is a hardware issue but I don't want to lose hope. The blue light is coming on when you plug it in but it doesn't blink and there is no noise whatsoever. Is there anything I can do to fix this issue so that I can recover the information on it? Thanks in advance for any help. It is greatly appreciated.
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Same problem: I can't see my Toshiba PH3100U-EXB (Gen 2) external hard drive when I plug it in. After awhile I get this error message (see attachment): USB Device Not Recognized. One of the USB devices attached to this computer has malfunctioned, and Windows does not recognize it. FOr assistance in solving this problem, click this message."
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Does it make a difference that the last time I used the external hard drive, we were in Windows XP and now we're in Windows 7?
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Attachments:
USB-NotRecognized.jpg ‏28 KB

External hard drive not recognized by OS

External FW HD not recognized by Disk Utility and "not available" to Time Machine. Had worked fine until last attempt to B.U. Core Duo, OS10.8.4. Suggestions to make this drive available again?

If the drive has more than one interface (USB, FireWire, Thunderbolt, eSATA), try one of the other interfaces.
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Try a different cable.
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If you're connecting it directly, try a different port.
Disconnect all other devices on the bus, or as many as possible.
Test the drive with another Mac. Test another drive with this Mac.
If the drive is bus-powered, but has an AC adapter, connect the adapter.
Boot into Recovery and launch Disk Utility. Is the drive recognized?
Start up in Safe Mode and test.
Reset the NVRAM.
Reset the System Management Controller.
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I've surfed around already before having my problem posted here because it's so frustrated…
AnaMusic: I've tried that but it isn't worked
Eric Ross: it's checked
LexSchellings: I did run "verify disk" and "repair disk" -> but no luck… My hard drive isn't mounted to Lion as shown in status. Is it something to do with NTFS format? I came across some forum and read that Lion is design to natively support NTFS..
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Oddjob70
<Subject Edited by Host>

Oddjob, the optical drive itself never shows up on the desktop,. What happens when you insert a disc? If a disc doesn't show up first check your connection. Try resetting the SMC Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support and PRAM How to Reset NVRAM on your Mac - Apple Support
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Alright, I'm gonna go ahead and close this thread. I found out the solution to my issue. Turns out it was a problem with a system file I changed right before installing. The error only occurred on a restart... the required 10.6.1 reboot was the first reboot since the change, so thus it looked like the culprit.
If you want a more thorough explanation of my problem (highly HIGHLY doubt it's gonna help you guys out), check this thread --> http://forums.appleinsider.com/showpost.php?p=1480362&postcount=8
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External USB drive not recognized in OS X after rebooting from Boot Camp

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