Can I attach any type of scsi drive to a macintosh?

Early generations of SCSI hard drive assemblies generally had two connectors (power and communication) for 8-bit units, and either two or three connectors for 16-bit units. The power connector was typically the same 4-pin female Molex connector used in many other internal computer devices. The communication connectors on the drives were usually a 50 (for 8-bit SCSI) or 68 pin male (for 16-bit SCSI) "IDC header" which has two rows of pins, 0.1 inches apart. This connector has no retaining screws to secure the connectors together, and ribbon cables are both inconveniently wide and somewhat delicate, so this connector style was primarily used for connections inside of a computer or peripheral enclosure (as opposed to connecting two enclosures to each other). Thus it is often called an "internal SCSI connector." It is worth noting that this type of header is used for most internal connections in a typical desktop PC, including the 40-pin (two rows of 20) version used for ATA disk drives.