CBR4012I Damaged scratch volume volser detected in library library-name.
Explanation
An error has been detected during Library Automation Communication Services (LACS) processing for the MOUNT or WAIT function. For a physical volume, library library-name has determined that the scratch volume volser has been physically damaged so that it cannot be loaded; the leader block is missing, or the tape medium has become detached from the leader block, or the tape medium is incompatible with the drive. For a logical volume in a Peer-to-Peer VTS library, the library determined that the tokens for the scratch volume selected are corrupted, making the volume unusable.
System action
The LACS scratch mount request fails with a warning return code, and the mount is retried with a different scratch volume. Messages issued by the caller of LACS are written concurrently with this message.
Operator response
Contact the system programmer.
System programmer response
For a physical volume, determine and correct the cause of the problem before reentering the volume back into the library. If the volume was mounted on an incompatible device, check the media type of the volume in the tape configuration database to determine if it is correct. If it isn't, first use IDCAMS to correct or delete the volume record in the tape configuration database and then determine why the library manager was reporting the wrong media type to the host. Once both of these items have been corrected, the volume can be reentered into the library. If it is a leader block problem, the volume must be repaired or replaced before the volume can be used. For a logical volume in a Peer-to-Peer VTS library, search problem reporting databases for a fix for the problem. If no fix exists, contact the IBM® Support Center. The library should have placed this volume in the corrupted token volume category X'FF20'.
Source
Object Access Method (OAM)