I'm sorry to hear that your drive is no longer accessible and would like to help you get this resolved.
Start by making sure that this is the only external drive connected. To regain access to the files, you'll need to use data recovery software. There are several available online, or you can use our version:
http://www.seagate.com/services-software/data-recovery-services/consumers/file-recovery-software/
Once you have your files recovered, move them to another hard drive.
Please test the drive with our SeaTools for Windows utility:
http://www.seagate.com/support/internal-hard-drives/enterprise-hard-drives/saturn/seatools-win-maste...
If the drive passes, try setting it up again by using the DISKPART command.
Note: Please ensure all other hard drives /thumb drives/memory sticks or any other recording media have been removed from your PC. This process will delete all data on the drive, so be sure only the boot drive and the external drive are connected.
- For XP, click on Start > Programs > Accessories > command prompt
- For Vista/ Win 7 Start > Type Command on the Start search box
- On the results menu, right-click on Command Prompt and select Run As Administrator
At the command prompt window type Diskpart. There should be a entry that appears as
DISKPART>
Now type List Disk, this will show all the disk drives that are currently detected (eg. Disk 0 , Disk 1)
Please type Select Disk 1
Replace (1) with the corresponding number listed on the List Disk for the hard drive that you want to erase. DISK 0 is your boot drive. Please DO NOT select this disk.
Now type Clean, press Enter, then reboot the computer. ( This will delete all partition
and data on the drive) You should now be able to perform a long format on
the hard disk drive.
How To Format The Drive In Disk Management
To partition and format your external hard drive, follow these steps:
A. Click Start
B. Right-click Computer or My Computer
C. Select Manage
D. Click Disk Management
E. Select the external drive
F. Right-click the large box to the right and select Delete Volume or Delete Partition
G. Now right-click on the Unallocated area
H. Select New Simple Volume or New Partition
I. Agree with everything until you see this:
Default
NTFS
New Volume = ( name you want to provide for the drive )
J. Then put a check mark in the box Perform a quick format
K. Select Apply or Start
L. When the drive is ready for use it will say NTFS - Healthy
