IDE HDDs
Many of the first PCs in the mid 1980s were outfitted with hard drives that used PATA (an acronym for Parallel Advanced Technology Attachment) and IDE (an acronym for Integrated Drive Electronics) technology. As with all older devices back then, parallel transmission was the order of the day, allowing for very limited throughput. An easy way to identify older IDE drives is to simply have a look at the interface where the data and power cables connect to the drive.
These older drives, as seen in the following image, have four pins for power, which connect to a Molex connector, separated by eight pins used to set the device as a master or slave device, and then 40 pins for the IDE data cable, which transmits the data to the motherboard: ...
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