Terms explained on the CloneCD Hardware Requirements:
Best Supported Write Mode: RAW-DAO (Disc At Once RAW Mode). A must have for every copy-protection. The best supported write mode of CloneCD.
Buffer under run Technology: Does the drive have a (supported) technique to prevent buffer-underruns?
Correct EFM encoding of regular bit patterns: Does the drive support SafeDisc2 ?
Best supported Read Mode for Audio/Data: Can the drive read the full SubChannels (96bytes), partial (16bytes) or none at all. Of course 96bytes would be best (for instance PlayStation games).
The HP do not support SafeDisc 2...