Technical info about Sony Atapi CD-ROM drives

I am interested in technical info about Sony Atapi CD-ROM drives CDU-77E and CDU-50E. Speed, transfer rate and so on. It seems that this drives are 4xspeed both. I don't need drivers, I want only any link to see info about them. (on SONY.COM there isn't any).
Best regards,
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For the CDU-77E I found the following site: and follow the specifications link on the bottom for further info.

CDU-50E: See for some info. Or try

Good luck.

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eizensAuthor Commented:
Thanks for fast hint. I am complitely satisfied with this information.
Best regards,
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