series N40P -> “Maxtor INIT SECURITY TEST STEP ” +1 or +2 spaces
series N40P -> “Maxtor INIT SECURITY TEST STEP F”
series 541DX -> “Maxtor” +24 spaces
series Athena (D541X model 2B) and diamondmax80 -> “Maxtor”
WESTERN DIGITAL -> “WDCWDCWDCWDCWDCWDCWDCWDCWDCWDCWD”
FUJITSU -> 32 spaces
SAMSUNG -> “ttttttttttttttttttttttttttttttttt” (32 times t)
IBM
series DTTA -> “CED79IJUFNATIT” +18 spaces
series DJNA -> “VON89IJUFSUNAJ” +18 spaces
series DPTA -> “VON89IJUFSUNAJ” +18 spaces
series DTLA -> “RAM00IJUFOTSELET” +16 spaces
series DADA-26480 (6,4gb) -> “BEF89IJUF__AIDACA” +15 spaces
HITACHI series DK23AA, DK23BA and DK23CA -> 32 spaces
TOSHIBA -> 32 spaces
For xbox hdds try “XBOXSCENE” or “TEAMASSEMBLY” too
There is also some software available to reset the password called MHDD, another suggested program is ATAPWD. A Commercial tool from HDDLock claims to unlock drives and prices vary with drive size.