My Book320 GB Premium Edition

Hi, If you format the drive you will erase everything on it including your files. I would run your ant-virus you may have a virus on it. Second save all your files on a back-up disc. Then format the drive if you can. good luck.

have you checked you usb connection? try unplugging it then plugging it back in see if computer recognises it then if not chances are your drive has failed

frist of all you have recover your data before u do any thing with HDD try it with any recovery software after that try to change your case still not detading then u r HDD is gone
try to recover your data first

If you are running Vista, You might be one of many people who are reporting an update that is causing some buggy behavior. Try this:

Connect the drive but do not Format the drive, right click 'my computer' then 'manage' go to 'storage/disk management' view the drives; your usb drive will not be allocated a drive letter. You can set one manually or leave it for about 2~5 minutes for one to be allocated auto. Each time you connect the drive you may have to do this.

Hi,
For Vista Home Basic >>>

• 1 GHz 32-bit (x86) or 64-bit (x64) processor
  
• 512 MB of system memory
  
• 20 GB hard drive with at least 15 GB of available space
  
• Support for DirectX 9 graphics and 32 MB of graphics memory
  
• DVD-ROM drive
  
• Audio Output
  
• Internet access (fees may apply)
  

Additional requirements Actual requirements and product functionality may vary based on your system configuration. Windows Vista Upgrade Advisor can help you determine which features and edition of Windows Vista will run on your computer.
While all editions of Windows Vista can support multiple core CPUs, only Windows Vista Business, Ultimate, and Enterprise can support dual processors.


For Vista Home Premium, Business and Ultimate >>>>>>

• 1 GHz 32-bit (x86) or 64-bit (x64) processor
  
• 1 GB of system memory
  
• 40 GB hard drive with at least 15 GB of available space
  
• Support for DirectX 9 graphics with:
  
  • WDDM Driver
    
  • 128 MB of graphics memory (minimum)
    
  • Pixel Shader 2.0 in hardware
    
  • 32 bits per pixel
    
• DVD-ROM drive
  
• Audio Output
  
• Internet access (fees may apply)
  

Additional requirements Actual requirements and product functionality may vary based on your system configuration. Windows Vista Upgrade Advisor can help you determine which features and edition of Windows Vista will run on your computer.
While all editions of Windows Vista can support multiple core CPUs, only Windows Vista Business, Ultimate, and Enterprise can support dual processors.
Home Premium / UltimateTV tuner card required for TV functionality (compatible remote control optional).
Home Premium / Business / UltimateWindows Tablet and Touch Technology requires a Tablet PC or a touch screen.
UltimateWindows BitLocker Drive Encryption requires a USB Flash Drive and a system with a TPM 1.2 chip.

Windows Vista minimum supported system requirements Home Basic / Home Premium / Business / Ultimate

• 800 MHz processor and 512 MB of system memory
  
• 20 GB hard drive with at least 15 GB of available space
  
• Support for Super VGA graphics
  
• CD-ROM drive
  

Regards.

Download a free disk partition manager from somewhere and use that to format it. Western Digital used to have some disk utilities on their website which would do it so it's worth looking there.

install usb 2.0 drivers again

Your My Book World should not be formatted or you will lose all ability to access it through the Network -- it will simply become a hard-drive at that point. There is software installed on the hard-drives that communicate with your Router in order to obtain an IP and be available as a Network Drive. If the drive and the Router are communicating, you should see an IP in the DHCP list of your Router. It is possible that the My Book World is not setup for DHCP, so if it is placed in an alternate environment with incompatible static IPs, it won't be able to access the Internet or be available locally. You can try a hardware reset on the drive and see if it pops up in your Router's DHCP/Client list, at which point it should also appear locally and over MioNet (MioNet will need to register the device to an account before it will appear in MioNet, but it must detect the drive locally in order to attach).

1. Turn off My Book World
2. Identify the reset button on the back of My Book World
3. Depress the reset button while restarting My Book World
4. Keep the reset button depressed for about 10 seconds after you see blue lights on My Book World

download a free hard disc eraser program erase the disc space, you do not need wd`s software. then reformat the drive from vista choose ntfs format

Try to scan it with R-Studio or GetDataBack.