Q1: I received a 40 GB drive in replacement for a 20 GB model in PC. The drive is reported as 20 GB capacity. How can i get full capacity ?
A1: If you see in 'Device List' menu at your disk drive a notice '!SET MAX: HPA IS ACTIVE', use 1. method, otherwise use 2. method.
In program HDAT2 select your disk drive and press Enter to show 'Main Menu'.
In 'Device List' menu at your disk drive you see notice '!SET MAX: HPA IS ACTIVE'.
Select 'SET MAX (HPA) Menu', then select 'Set Max Address' and press Enter. By default is set so called native size of disk drive disku and you can just press a key 'S' to setup original capacity of hard drive and remove HPA area.
If the command is aborted, try change 'LBA mode' from 28 to 48 or vice versa (if disk supports 48-bit LBA mode).
Select 'Device Configuration Menu', then select 'Restore' and press Enter. If you don't see any error message, in 'Device List' menu press a key 'D' to make new detection of devices or simple make restart of PC's and check capacity of your hard drive.
If you see any error message or in 'Device List' menu at your disk you see a notice '!DCO: FROZEN', then it is possible that BIOS was sent a command DCO Freeze and all subsequent DCO commands will be aborted now. How to try bypass this state see answer nr. 2.