I wouldn’t recommend directly confronting Dell on this issue. Rather realize that this is a common problem, and if your drive never seems to clean properly, doing delay and call Dell for technical support. Typically the drive requires to be replace.
However, be sure you still perform regular troubleshooting steps including:
- Upgrading the Tape Drive Firmware/Drivers
- Upgrading the server BIOS
- Upgrading the SCSI controller Firmware/Drivers