Here is a link to the answer; http://www.directron.com/patasata.html
A "serial to parallel" converter converts a serial data connection to a parallel data connection. For example, in computer storage, there are controller chipsets that convert SATA (Serial ATA) to PATA (Parallel ATA, also called IDE or EIDE).
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Serial ATA was created in 2003.
ATA Connection was created in 1993.
ATA/ATAPI-7 -Serial SCSI standard is compatible with serial ATA drives in the same system
SATA (Serial ATA)
The serial ATA connector on the motherboard.
ATAPI-7
Serial ATA are thin cables that don't hinder airflow inside a case as much as the wide parallel ATA cables do.
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A serial hard drive is the same as a SATA hard drive. SATA is Serial ATA, and PATA is Parallel ATA.
Another advantage of serial ATA is the thin cables don't hinder airflow inside a casde as much as the wide parellel ATA cables do.