Hard Drives by brand:

Toshiba - 1.15%
Seagate - 1.44% (1.65%)
Western Digital - 1.55% (1.44%)
Samsung - 2.24% (1.30%)
Hitachi - 2.40% (3.45%)

 

Hard Drives by models:

WD Caviar Black 1.5 TB (WD1502FAEX) - 5.04%
Hitachi 7K1000.C 1 TB (HDS721010CLA332) - 4.94%
Hitachi 7K3000 2 TB (HDS723020BLA642) - 4.87%
Seagate Barracuda 320 Go (ST320DM001) - 3.57%
WD Caviar Red 2 TB (WD20EFRX) - 3.51%

2TB Hard Drives:

Hitachi 7K3000 (HDS723020BLA642) - 4.87%
WD Caviar Red (WD20EFRX) - 3.51%
Samsung SpinPoint F4 (HD201UI) - 3.01%
WD Caviar RE4 (WD2003FYYS) - 2.12%
WD Caviar Black (WD2002FAEX) - 1.97%
Seagate Barracuda 7200.14 (ST2000DM001) - 1.95%
WD Caviar Green (WD20EARX) - 1.30%
WD AV-GP (WD20EURS) - 1.01%

3TB Hard Drives:

WD Caviar Green (WD30EZRX) - 2.85%
Seagate Barracuda 7200.14 (ST3000DM001) - 2.71%
WD Caviar Red (WD30EFRX) - 1.89%