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The file database on the hard drive is probably corrupted. (Formatting would have wiped out the database completely.)You would need to find a compatible disc utility to repair the database. If the computer to which you connect the drive is able to write to the drive, its disk utility program will probably work.
You can probably identify the file system on the hard drive by getting volume info (part of "Properties") in a file browser window. For more information on file system compatibility, see the article linked below. What File System Should Use for My USB Drive
Check that the power cable is securely connected to the external
drive and wall socket (applies only to desktop external hard drives).
Do not connect the drive through a USB hub, connect it directly to
the PC or laptop. Make sure the power adapter is connected directly to a
wall outlet, not to an extension cord.
Ensure the cable is securely connected to both the drive and computer.
If your external hard drive came with with a Y-cable, use both USB
connectors to ensure the drive is getting the appropriate power.
If you are connecting to a PC, use the USB ports found on the back
of the computer. Avoid using USB ports found on keyboards, monitors or
the front of the PC.
If the problem still continues, try using a different USB port.
STEP 2 Check the Drive Partition in Disk Management
Even though the drive may not be visible on the "Desktop" or in "My
Computer," check to see if the drive is recognized in "Disk Management."
Right click on "My Computer" and select "Manage" from the menu.
From the "Computer Management" window select "Disk Management" from the menu on the left.
In "Disk Management" check to see if the drive is visible. If the
drive is found, look at the partition for the drive. New drives will be
labeled as FAT32 and have a drive letter assigned.
If the drive does not display as "Healthy," or shows the file format
as "RAW," then the partition has become corrupt. It could also be
corrupt if the bar above the drive is black and shows as "Unallocated."
To make the drive usable again after a partition has become corrupt
or lost start by right clicking on the drive in "Disk Management" and
select "Delete partition" from the menu. Then right click on the drive
again and select "create partition" from the menu. Follow the steps in
the partition wizard to create a Primary partition.
Deleting the partition will cause all data on the drive to be lost. If
the partition has become corrupt this may be unavoidable. HGST is not
responsible for lost data. It is highly recommended that data be backed
up in multiple locations on multiple drives to minimize data loss.
After the new primary partition has been created "Disk Management"
will display the drive with an NTFS partition. The NTFS partition is
unusable on a Mac. If the drive is used on Macintosh and Windows
computers, follow the link below to obtain a FAT32 formatting tool which
will allow both Windows and Macintosh users to use the drive. http://www.ridgecrop.demon.co.uk/index.htm?fat32format.htm
STEP 3 Check the drive status in Device Manager :
Right click on "My Computer" and select "Manage."
From the "Computer Management" window select "Device Manager" from the list on the left.
From the device list, expand the "Disk Drives" category by clicking
on the [+] symbol found to the left. If the drive is detected by the
system, there will be an entry for your external drive.
If it is not listed under "Disk Drives," expand the "Other Devices"
category and see if there is an entry for an "Unknown Device."
Right click the "Unknown Device" and select "Properties."
Under the "General" tab, it will typically display "This device is not working properly" followed by either Code 10 or Code 28.
Code 10 would suggest a potential power supply issue
(typically 3.5-inch desktop external drives). If a second external drive
with an equivalent power supply is available, try connecting the power
supply to the drive.
Before connecting a power adapter that did not ship with the external
hard drive, verify that the power configuration matches exactly with the
power adapter that was supplied. Failure to use the correct power
supply can result in damage to the unit, injury or fire.
If a different power supply is not available, verify the problem by
connecting to a different USB port or by connecting to a second PC.
If the same error code is still displayed, create an RMA and return the drive under Warranty.
Code 28 would suggest a driver error.
Expand the "Disk Drive" category in "Device Manager" right click on the drive and select "Uninstall."
Disconnect the external drive, reboot the computer and reconnect the drive when the computer has finished restarting.
If same error is displayed, try connecting it to a second PC to verify the issue.
If the drive fails on the second PC with the same error, create an RMA and return the drive under Warranty.
Below is a listing of the full error message that may be related to this error.
Windows NT could not start because the below file is missing or corrupt:
Cause: Keyboard issue Miscellaneous corruption Corrupt boot.ini file. Missing boot.ini file. Missing or corrupt ntoskrnl.exe file. Windows NT installed on a partition bigger then 7.8GB Corrupted hard disk drive or severely corrupted Windows.
This issue has also been known to be caused by a short in the ground wire in the keyboard cable. Make sure this is not the cause of your error by replacing the keyboard with a different keyboard or simply just disconnecting the keyboard from the computer.
Before trying any of the below recommendations it's recommend that you attempt to load the last known good configuration. Additional information about doing this can be found on document CH000626.
Corrupt boot.ini file
This issue is often caused when the boot.ini is missing or improperly configured. This issue often arises after a user has recently added or removed an operating system on the computer or added or removed hard disk drives in the computer.
Make sure the line pointing to the operating system and it's drive and partition is properly configured in the [boot loader] and [operating systems] section. Additional information about boot.ini can be found on document CH000492.
Missing boot.ini file
Microsoft Windows XP users:
If the boot.ini is severely corrupted or missing a user running Microsoft Windows XP can rebuild the boot.ini to resolve this issue. Additional information about rebuilding the boot.ini can be found on document CH000648.
Microsoft Windows NT and Windows 2000 users:
To restore the original boot.ini file in Microsoft Windows NT or Windows 2000 you will need an ERD and follow the below steps. If you do not have an ERD you will be unable to follow these steps.
Boot the computer with your Windows NT three setup diskettes or the Windows 2000 setup disc. In the setup menu, type R to start the repair. When prompted for the ERD diskette insert the diskette and inspect the startup environment.
Missing or corrupt ntoskrnl.exe file If the ntoskrnl.exe file is corrupt or missing this can also generate the error. To restore this file follow the below steps.
Insert the Microsoft Windows XP CD. Note: If you have a recovery CD or a restore CD and not a Microsoft Windows XP CD it is likely the below steps will not resolve your issue. Reboot the computer, as the computer is starting you should see a message to press any key to boot from the CD. When you see this message press any key. In the Microsoft Windows XP setup menu press the R key to enter the recovery console.
Select the operating system you wish to fix, and then enter the administrator password. Type expand d:\i386\ntoskrnl.ex_ c:\windows\system32 You will then be prompted if you wish to overwrite the file type Y and press enter to overwrite the file. Type exit to reboot the computer.
Windows NT installed on a partition bigger then 7.8GB If you are running Microsoft windows NT 4.0 on a partition larger than 7.8GB this issue can occur if the boot files are located outside this limitation. When this error occurs your computer will have the
error message as shown below.
OS Loader v4.01 Disk I/O error status=00000001 Windows NT could not start because the below file is missing or corrupt: winnt\system32\Ntoskrnl.exe
Please reinstall a copy of the above file.
If your system partition is larger than 7.8GB you will need to delete the partition and recreate the partition to 7.8GB or less. Additional information about this issue can be found on Microsoft KB Q224526.
Corrupted hard disk drive or severely corrupted Windows Attempt to check the hard disk drive for any errors by running the chkdsk error. To do this follow the below steps.
Insert the Microsoft Windows XP CD. Note: If you have a recovery CD or a restore CD and not a Microsoft Windows XP CD it is likely the below steps will not resolve your issue. Reboot the computer, as the computer is starting you should see a message to press any key to boot from the CD. When you see this message press any key.
In the Microsoft Windows XP setup menu press the R key to enter the recovery console. Select the operating system you wish to fix, and then enter the administrator password. Once at the recovery console type chkdsk /r Once completed type exit and see if issue is resolved. If after trying all of the above steps you are still encountering the same issue it's likely that Windows is severely corrupted and it is recommended you attempt to reinstall Windows. Additional information about erasing the computer and starting over can be found on document CH000186.
Finally, if during the Windows installation you encounter errors it's likely that your hard disk drive is bad.