Can Color Classic I & II boot from SCSI CD-ROM?

[LaPorta]

Johnny and I may vvary on opinion here, but I don't think it matters at all. That being said, I don't often use super-ancient SCSI CD drives. However, images I burn at max possible speed on my modern BluRay drive work fine in, say, my PowerMac 6100 drive internally with no issue.

 

[MacKilRoy]

Johnny and I may vvary on opinion here, but I don't think it matters at all. That being said, I don't often use super-ancient SCSI CD drives. However, images I burn at max possible speed on my modern BluRay drive work fine in, say, my PowerMac 6100 drive internally with no issue.

I think where this comes from is when CDR media began to increase in write speed. The higher speed media was problematic in low speed drives, but it would work just fine in high speed drives, providing it was burned at a slower speed so that it could be more easily read in a slower speed drive.

It wasn’t always a problem but there was a period of time where the drive burning the CD, along with the media type being used, along with the target drive age and read speed, played a critical role in whether the CD worked or not.

But also, just because a burned CD verifies in the drive that burned it, doesn’t mean another drive won’t have issues with it. Especially if 80min/700mb discs are used. Some older drives had compatibility issues with those slightly higher capacity CDRs.

 

[ried]

Received the original Mac OS 7.6 CD today and can confirm that it indeed boots the Color Classic when used with the SCSI CD-ROM. I tried several 7.6 and 7.6.1 CDs that were burned and verified with Toast, but none of them worked. The original media works perfectly.

 

[Johnnya101]

The write spread matters because the old drives can really only go to 4x reliably, with really old ones, less. By old drive, I mean 1995-1996 ish and earlier. If the original disc works, then your problem lies in how you're burning the disc, most likely. The old drives are super sensitive. Forgot to mention, CD RW sometimes do not work either, so make sure you are using CD Rs.

You could try copying the original disc to a new one at different speeds (if toast gives you the option) to try this out if you care.

But glad you got it working.

 

[pizzigri]

I’d like to resurrect this thread because I had the same exact problem as the OP. I found out - by sheer accident - that Toast, even in my ancient iMac LCD 700Mhz, defaults to hfs+ for the CD; a flag must be enabled in Toast, and the software must be old enough to actually have that flag. Mine was ver. 10.
Reposting from the Toast forum, a reply from 2009:

In Toast Preferences put a check mark next to Show legacy formats. Then choose either Mac Only or Mac & PC as the format in the Data window. At the bottom of the left panel there is a place to select "Use HFS Standard."
hope it helps whoever comes here with the same problem....