MSI P43 - Manual (Page 29)

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Hardware Setup
Serial ATA Connector: SATA1~6
This connector is a high-speed Serial ATA interface port. Each connector can connect
to one Serial ATA device.
SATA3
SATA4
SATA1 SATA5
SATA2 SATA6
Important
Please do not fold the Serial ATA cable into 90-degree angle. Otherwise,
data loss may occur during transmission.