From: Retired Moderator
More than likely, this is a firmware issue. Try communicating with the company you purchased the drive from Mitsumi, and tell them the exact brand of media, and submit the ATIP to them, perhaps they will upgrade the firmware to allow higher write speeds with that particular media.
This is always a concern with a cdrw drive, as new media is introduced, it is not always immediately available, because the companies have not had time to analyze the media, and determine it's best write speed for the drive. When you read the review, the review includes the media used for testing, perhaps you could obtain some of this particular media, or at a last resort, the one the manufacturer has recommended to you.
I understand your frustration, but as stated above, media and firmware are always an issue with a drive.
LG GSA H22L Firm 1.02
Samsung SH-203N Firm SB01
LiteOn SOHD-16P9S Firm FS0D