by 
The Curious Bag
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Notebook computers have made our lives easier by enabling us to work wherever we want. The main problem with this is that notebook computers don't have the same storage capacity as desktop systems.
Expansion Slots
One way notebook manufacturers provided to increase the capabilities of their products was to include expansion slots so users could insert cards to add storage, communication ports or TV tuners. The most popular size was the Type II PC card, also known as a PCMCIA card.
Storage Interfaces
Small Computer System Interface (SCSI) was developed to overcome one of the glaring issues with the IDE interface, the two-drive-per-bus limit. SCSI allowed you to attach up to seven drives on one bus.
SCSI Drive Towers
External drive towers were developed to allow computer users to have large amounts of storage outside of a single computer. This allowed the user to connect the tower to different computers, enabling easy access to large data files.
Adaptec APA-1460d
Adaptec's APA-1460d card enabled people who had a notebook with a Type II PCMCIA slot to connect to these external SCSI devices. The included EZ-SCSI software facilitated communication between the computer and the drives.
Method of Connection
The APA-1460d came with two connector cables. One cable was for standard low-density 50-pin SCSI devices. The other was for higher-density 50-pin SCSI II devices.
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