wtcx@batcomputer.tn.cornell.edu (Tom Clodfelter) (06/05/90)
I recently purchased an NEC CDR35 CD-Rom drive. I had heard that the drive was really slow but I was prepaired to put up with that due to the price of the drive. I found out through testing that this drive is not tollerant of other SCSI devices. It slowed down the access to my hard disk by causing SCSI errors and disk timeouts. With this device powered up, the speed of my systems IO was cut to 25%. Turn the device off and everything was normal. The addresses and termination of my SCSI were set up correctly. This device selected any time any SCSI device was used. It would hold the bus until it had spun up, even though it was not being accessed. This was a real diappointment. I really like the idea of the portable drive. It was totally useless on my Mac IIcx and while it was turned on it made my Mac totally useless as well. Needless to say it is on its way back to MacConnection. A cryptic note in the NEC package seems to indicate that the device is designed to be the sole device on the SCSI bus. This makes it somewhat useless on a Mac.
phil@vaxphw.enet.dec.com (Phil Hunt) (06/05/90)
In article <10365@batcomputer.tn.cornell.edu>, wtcx@batcomputer.tn.cornell.edu (Tom Clodfelter) writes... } }I recently purchased an NEC CDR35 CD-Rom drive. I had heard that the }drive was really slow but I was prepaired to put up with that due }to the price of the drive. I found out through testing that this }drive is not tollerant of other SCSI devices. It slowed down the }access to my hard disk by causing SCSI errors and disk timeouts. }With this device powered up, the speed of my systems IO was cut to 25%. }Turn the device off and everything was normal. The addresses and }termination of my SCSI were set up correctly. This device selected }any time any SCSI device was used. It would hold the bus until }it had spun up, even though it was not being accessed. } }This was a real diappointment. I really like the idea of the portable }drive. It was totally useless on my Mac IIcx and while it was }turned on it made my Mac totally useless as well. Needless to say }it is on its way back to MacConnection. } }A cryptic note in the NEC package seems to indicate that the device is }designed to be the sole device on the SCSI bus. This makes it somewhat }useless on a Mac. I have had the same problem with other devices. You might find that the drive had a built in terminator or something real stupid like that. I have 3 hard disks, an Apple CDROM, and an EMAC tape connected to my mac. Yes, connecting in just the right order works, every other type of connection causes problems just like you describe. Try connecting the CDROM AFTER the HD. ================================================================== Phil Hunt "Wherever you go, there you are!!!" Digital Equipment Corporation Phone: (508)486-2164 ENET: VAXPHW::PHIL USENET: phil@vaxphw.enet.dec.com MOREUSENET: phil%vaxphw.dec@decwrl.enet.dec.com EVENMORE: ....!decwrl!dec-vaxphw!phil