Plextor, Adaptec, and Erik of CDSpeed might want to consider putting a
note describing this issue on their respective websites.
Adaptec technical support solved a problem I and others have been
experiencing with Ultraplex maximum data transfer rates 8x lower than
they should be and PCAV instead of CAV type reading of data discs for
either 32max or 40max models, as reported by CD Speed under W98 with
Adaptec 2940 series SCSI adapters. CD Speed URLs:
Plextor technical support has been instructing Plextor users of CDR
drives to set their SCSI card configuration such that Initiate Synch
Negotiation is set to NO (default is YES) for both the CDR and CDROM
drives. While setting this parameter to NO might be important for stable
operation of the CDR drive, setting it to NO on the CDROM drive results
in the undesirable performance reduction outlined in the previous
paragraph. Setting the parameter to YES for the CDROM drive resulted in
normal maximum data transfer rate and CAV type reading.