Member Avatar for Slade

Windows, nor bios, will detect the usb hdd. It's 250gb, the cable plugs into a usb port on the computer and a usb 2.0 on the hdd. There is definitely power to it, and everything is connected right, so whats wrong?

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Dani AI

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noted that neither BIOS nor Windows XP see the 250 GB enclosure. and were right to point toward Disk Management when a drive is present but not mounted, but when nothing shows there either, a simple partition/format step won't help. The problem space to check next is: (a) power/USB connectivity, (b) the USB‑to‑drive bridge in the enclosure, and (c) host drivers/BIOS enumeration.

Practical isolation checklist:

  • Confirm the enclosure actually spins and the activity LED behaves like a drive (not just power). Some bus‑powered enclosures need a Y‑cable or separate adapter.
  • Try a different USB cable and a rear motherboard USB 2.0 port (not a front panel or hub). Test the same enclosure on a second PC to rule out a single‑machine issue.
  • Look in Device Manager for any "Unknown device" or entries under USB controllers (remove/uninstall stale entries and let Windows re-detect). Updating the motherboard chipset/USB drivers can help on older XP systems.

Bridge / firmware limits and a safe diagnostic:

  • Older USB↔IDE bridge chips and older BIOSes sometimes hit a ~137 GB limit (28‑bit LBA). That can make larger disks invisible or misreported. If spare tools are available, temporarily connect the bare drive internally (or into a known modern adapter/enclosure) — opening an enclosure can void warranty and needs ESD care — to see whether the drive itself is healthy.

If the drive works internally but not in the enclosure, the enclosure’s bridge or power circuit is suspect. If it fails internally too, the disk may be defective. Replacing the enclosure or testing with a known good adapter is an efficient next step.

Recommended Answers

All 7 Replies

Member Avatar for Slade

Forgot: Running windows XP Pro

Member Avatar for Coconut Monkey

Does it show up in Device Manager? You just might need to "activate" it and set up a formatted partition.

Here's a guide.

Member Avatar for Slade

nah, didn't show up, and the drivers are installed off the xp address so none are included.

Member Avatar for alc6379

What about in Disk Management?

Click on Start, right click on My Computer, select Manage. Once you're there, you should see a Folder on the left hand side that says "Disk Management". Click on that.

If Windows is recognizing the drive, you should see an entry in there.

Member Avatar for Jaggedge Scythe

Hi alc6379, would just like to thank you for the instructions! had a similar problem where i plugged in my 40Gb portable hdd and though there was power,no new drive appeared in My Computer..

Followed your instructions and went to *right-click*MyComputer > Manage, and selected Storage>Disk Management..

saw my drive as "Disk 1", so i right-clicked on the white box beside it and formatted/partitioned the drive..haha..didn't realise i had to do that... ;)

Thanks again,and for anyone else with this problem, i hope it helps!

cheers

Member Avatar for Catweazle

HAHAHAHAHA!!!!!!

If you'd clicked on the link in the post Coconut Monkey made 3 days earlier, you'd have found the same intructions as Alex gave, and had it running a lot earlier.


......wanders off giggling :D

Member Avatar for feigned

XP base install, or XP Pro SP1?

Hell, does it even matter since it's USB? This of course is assuming that the controller in the external case is more than capable of reading the entire 250GB disk.

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