The theoretical maximum amount of hard disk space under Macintosh OS is:
- 2 to the 48th power bytes
- 262,144 gigabytes
- 256 terabytes
The theoretical maximum amount of hard disk space (file system) under Macintosh A/UX is:
- 2 to 31st power -1 blocks
- 2,199 gigabytes for 1K block filesystem
- 1,099 gigabytes for 512-byte block filesystem
Eight unique IDs are available for SCSI devices: 0 through 7. The Macintosh is always assigned number 7, and the internal hard disk (if you have one) is always assigned number 0. Therefore, you can assign SCSI ID number 0 through ID number 6 (total of seven devices, including internal hard disk) to form a SCSI chain on either Macintosh OS or Macintosh A/UX.
At present, the Apple HD 20SC, 40SC, 80SC, 160SC internal and external SCSI drives are the only ones formally supported by Apple. The following are third parties that support large disk drives for A/UX:
- CMS Enhancements, Inc.
- Racet Computers
- FWB Software, Inc.
- Control Data Corporation (CDC)
The Tech Info Library article titled "Locating Vendor Information" can help you search for a particular vendor's address and phone number.