HDD IDE vs SATA

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Different interface. Same internal components. SATA has a brighter future, IDE will be phased out. SATA allows for higher data transfer rates. SATA has a thinner data cable than IDE.
 
The maximum transfer rate of PATA - aka IDE, ATA is 133

SATA starts at 150 and goes up from there.

SATA II is 300

The cables are smaller, and there is no "jumping" or slaving of drives.
 
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