eSATA port assembly for PCI

HP 645558-001 is an eSATA port assembly supplied as a PCI card. It is an expansion part for adding an eSATA port to a compatible HP desktop configuration. HP lists this exact spare part in its Microtower and Small Form Factor chassis parts catalogs.

This identification makes it useful when replacing the eSATA PCI card assembly in a system that uses this HP spare part. The reference describes the assembly and card format; it does not specify additional technical details such as port count or transfer rate.

The manufacturer’s parts catalog lists it for both Microtower and Small Form Factor configurations.