Editing Macintosh II (section)

== Storage Systems ==
[[File:Quantum ProDrive LPS.png|thumb|292x292px|Quantum ProDrive]]

=== Internal Hard Drive Support ===
The Macintosh II was the first Macintosh to include an internal hard drive as standard equipment, typically shipping with a 40 MB SCSI hard drive. The internal drive bay could accommodate a single 3.5-inch half-height hard drive, with power and data connections provided directly from the motherboard. The internal SCSI bus supported synchronous and asynchronous data transfers, with a maximum theoretical transfer rate of 5 MB/second, though actual performance was typically lower due to drive limitations.<ref>{{cite book |last=Engst |first=Adam |title=Internet Starter Kit for Macintosh |year=1993 |publisher=Hayden Books |pages=45-47}}</ref>

Popular internal hard drive options included:
* Apple HD SC (20, 40, or 80 MB capacities)
* Quantum ProDrive series
* Seagate ST-225 and ST-251 series
* Maxtor XT series

=== Floppy Disk System ===
The Macintosh II incorporated a single 3.5-inch floppy disk drive using Apple's [[SuperDrive]] technology, capable of reading and writing 800 KB double-sided disks. The drive utilized the [[Integrated Woz Machine]] (IWM) controller chip, providing compatibility with 400 KB single-sided disks from earlier Macintosh systems. In 1988, Apple introduced the [[FDHD]] (Floppy Disk High Density) SuperDrive, which added support for 1.44 MB high-density disks while maintaining backward compatibility.<ref>{{cite journal |title=Apple's SuperDrive: A Technical Overview |journal=MacTech |volume=4 |issue=3 |year=1988 |pages=23-29}}</ref>

=== SCSI Implementation ===
The Macintosh II featured a sophisticated SCSI implementation based on the NCR 5380 SCSI controller chip. The SCSI bus supported up to seven devices in addition to the Mac itself (which occupied SCSI ID 7), with both internal and external connections available. The external SCSI port used a DB-25 connector, which became standard across the Macintosh line.<ref>{{cite book |last=Pilgrim |first=Aubrey |title=Macintosh Hard Disk Management |year=1988 |publisher=Sybex |isbn=0-89588-508-8 |pages=78-92}}</ref>

Key features of the SCSI implementation included:
* Support for SCSI-1 standard
* 8-bit parallel data transfers
* Maximum cable length of 6 meters
* Automatic termination power
* Support for disconnect/reconnect operations

=== External Storage Options ===
The robust SCSI implementation enabled connection of various external storage devices:

'''External Hard Drives''': Popular manufacturers included La Cie, FWB, MicroNet, and Jasmine, offering capacities ranging from 20 MB to over 1 GB by the early 1990s. These drives often included additional features such as backup software, disk utilities, and sometimes additional SCSI ports for daisy-chaining.

'''Removable Media Drives''': The Macintosh II supported various removable media systems:
* SyQuest removable cartridge drives (44 MB and 88 MB)
* Bernoulli Box drives from Iomega
* Magneto-optical drives
* Tape backup systems including QIC and DAT formats<ref>{{cite magazine |title=Removable Storage Roundup |magazine=MacUser |date=June 1989 |pages=156-178}}</ref>