Please refer to the following Technote for Veritas Hardware Compatibility List(HCL) for Backup Exec v8.6 and check if the devices used are present in the list.
Technote: VERITAS Backup Exec for Windows NT/2000 v8.6 Device Support List for All Devices
http://support.veritas.com/dsl/verselect_ddProduct_BEWNT_prod1_NT86.htm
Note: Please copy the above link in the browser to open.
Please download the latest device drivers for Backup Exec v8.6
Technote: 8.6 (All Builds) - Device Driver Release (20021101) and Robotic Library Release (36) (Intel Only) http://seer.support.veritas.com/docs/251862.htm
If the device is not mentioned, Veritas does not guarantee you a reliable data storage/protection for the device which are not explicitly tested. We highly recommend that the device has to be mentioned in our HCL, for Backup Exec to work properly.
Please try using the device drivers provided by the hardware manufacturer if the device is not present in the HCL and drivers are not available.
Adding support to a particular Backup Device in Backup Exec (Hardware Compatibility List - HCL) is a joint effort between the Device Vendor and Veritas. Therefore it is difficult to make any comment on when a particular device is made available in HCL.
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Please verify the media set properties to resolve the issue: ""Please insert media label xxxxx".
You may like to refer to the following technotes for more information to resolve the issue.
1) Title:- "Basics for Advanced Device and Media Management (ADAMM) for Backup Exec for Windows NT v7.01 - 8.x." http://www.seer.support.veritas.com/docs/192265.htm
2) Title:- "An explanation of the Overwrite Protection Period and the append Period."
3) Title:- "How to create user-defined Media Sets in Backup Exec for Windows NT and Windows 2000."
http://www.seer.support.veritas.com/docs/236670.htm
The alerts can be answered automatically, please refer to the following technote for more information.
Title:- "How to automatically respond to informational alerts in Backup Exec for Windows NT and Windows 2000 version 8.x."
http://seer.support.veritas.com/docs/235873.htm
We hope this helps.