CrystalDiskInfo is an HDD utility that allows you to view details of your hard disk drive.

Features:

Supports S.M.A.R.T.

Show HDD Information such as temp, disk size, transfer mode, buffer size, more.

Easy-to-understand user interface

Monitor health status and temperature

Graph of S.M.A.R.T information

What's New in version 2.0.4:

NEW : Supports a part of external USB/IEEE 1394 disks (External Disk List) 

NEW : AAM/APM Control for PATA/SATA/USB-HDD