USB stick not recognised.

Without reason all my USB sticks 64GB are no longer being recognised. My other USB sticks of various capacity size can be used normally. Can this error be rectified?

 

All drivers appear to be updated.
USB 64Gb memory sticks are the only ones failing to be recognised or opening when inserted in USB socket. All other sizes 4-42Gb respond though after a lapse of few seconds.

 

Doesn't Windows update these kind of drivers automatically?

 

http://answers.microsoft.com/en-us/...indows-7/8106a712-a13e-4ca5-b82e-c3961cc254b1

The most common repair seems to be > Device Manager > USB Controllers > Uninstall (ALL) and close and Restart comp and let Windows reinstall the Drivers. Neil.

 

Checked Device Manager, unable to find reference USB Controller only Disk Drivers.

 

You're running W7 64bit?
My Notebook W8 and my Vista Desktop both show Universal Serial Bus Controllers as the bottom (last) entry in Device Manager.
If you haven't got it - that's your problem.
Sounds like a fresh install might be needed. Neil.

ps. Try a reinstall of your Motherboard drivers and Chipset first. Bios could in need of an update too.

 

My apology, USBC is indeed listed. The list has many entries, do you mean remove all entries shown in list?
Windows 7 64bits Home Premium.

 

Yes, (it's in the instructions that retiredlearner linked you to).

Then restart your computer and Windows 7 will reinstall all USB controllers automatically.

 

I carried out your suggestions, well in part. Deleted down to Intel(R) Family USB Universal Host Controller 2936 when computer completely froze, requiring a cold start of computer. Did you mean USB Composite Storage devices and Hub?

 

Yes, Delete all and shut down and Reboot. Windows will reinstall.
Thanks Doc, had to spend some sleep time. Neil.

 

Carried out procedure again, only a few USB entries deleted and reinstalled by Windows. USB stick 64Mb remains as not recognised.

 

The remedy was to uninstall ALL USB references - Shut - Reboot. If you only closed some, you will not get Windows to install correctly. Neil.

 

Neil, I fully appreciate in what you say. However, I uninstalled six entries and the computer went into the freeze mode and exercise terminated.

 

Try deleting them all in Safe mode. Then when it reboots, let it boot back up into normal mode so Windows can get them reloaded, (hopefully correctly this time).

 

Afraid not. Thanks for your patience, not understand reason for not reading the 64Gb USB sticks.

 

Have tried to contact the USB maker for help?

 

Are the 64GB USB sticks readable in another computer?

 

What Brand are your 64GB sticks?
I have Rundisk, Lexar, Transcend,2x Adata, Emtec and Cruzer from 4GB, 8GB and 32GB sticks and all are recognized in XP, Vista and W8 systems and immediately.

There's got to be something odd with your OS. Report back if you can confirm Doc's suggestion of trial of sticks in another computer. Neil.

 

Here's a link I found on Google - is this a possible reason your USB is not recognized? USB not recognized in W7 64Bit.
http://forums.seagate.com/t5/GoFlex...ve-not-recognized-under-windows-7/td-p/155743
I know this relates to a Seagate unit, but this problem may be in your W7 OS. Neil.