Which type of internal hard-drive interface uses a 40-pin ribbon-cable connector to attach drives to the motherboard?
68-pin SCSI (Ultra-Wide)
M.2 NVMe
Serial ATA (SATA)
Parallel ATA (IDE/PATA)
Parallel ATA, commonly called IDE or PATA, employs a 40-pin female connector on both the motherboard and the drive. Later Ultra ATA versions introduced an 80-conductor ribbon cable to reduce crosstalk, but the connector itself still has 40 pins. The other options have different pin counts: SATA uses a 7-pin data connector, 68-pin SCSI uses 68 pins, and M.2 NVMe drives use an edge-connector card edge rather than discrete pins.
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