The SCSI circuitry used on the Macintosh PowerBooks (and consequentially, the throughput of the port) is the same as that used in all Macintosh computers. The new HDI-30 SCSI port connector has the same signals as the DB-25 connector, and the HDI-30 throughput is the same as other Macintosh computers.
Hard disks compatible with the Macintosh IIci, for example, work with the Macintosh PowerBooks.
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