Firm

Types

Disk

Head

Pre-amp

Lead-channel

Motor

Seagate

3.5 inch

◎

◎

×

×

×

Maxtor

3.5 inch

◎

◎

×

×

×

WD

3.5 inch

×

◎

×

×

×

Hitachi

All

◎

◎

◎

◎

◎

Toshiba

2.5 inch less

×

×

×

×

×

Fujitsu

3.5E and 2.5

◎

△

×

×

×