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Try Reinstalling the BackupExec Device Driver Patch Package:<br />
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<a href="http://seer.entsupport.symantec.com/docs/300325.htm" rel="ugc nofollow">http://seer.entsupport.symantec.com/docs/300325.htm</a><br />
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Try Reinstalling the BackupExec Device Driver Patch Package:

http://seer.entsupport.symantec.com/docs/300325.htm [http://seer.entsupport.symantec.com/docs/300325.htm]



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I ran into this problem once before myself. Remove the tape drive completely using device manager and reinstall it. That worked for me but it took a lone time to get this done.... I never used the Symantec drivers because they did not work for me, they never saw the drive which is what seems to be happening to you.
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I ran into this problem once before myself. Remove the tape drive completely using device manager and reinstall it. That worked for me but it took a lone time to get this done.... I never used the Symantec drivers because they did not work for me, they never saw the drive which is what seems to be happening to you.

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I had to resize the C drive on my backup server. now backup exec doesn't see mt lto drives. i'm running symantec on server 2003 x64 bit storage edition. the o/s see's both lto's but symantec won't let me add them back into the device pool. 
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I had to resize the C drive on my backup server. now backup exec doesn't see mt lto drives. i'm running symantec on server 2003 x64 bit storage edition. the o/s see's both lto's but symantec won't let me add them back into the device pool. 

backup exec not seeing lto drives

The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.

Storage Software

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.