Samsung 100737108-A User Manual

Spinpoint M8-DVR OEM Product Manual REV 1.0

8.2.21 Recalibrate (10h)

This command is obsolete in the ATA7 specification. The supporting of this command is for backward
compatibility purpose. The use of this command is beyond the ATA standard and not recommended by the
manufacturer.

This  command  moves  the  read/write  heads  from anywhere  on  the  disk  to  cylinder  0.  Upon  receipt  of  the
command,  the  drive  issues  a  seek  to  cylinder  zero.  The  drive  then  waits  for  the  seek  to  complete  before
updating  status,  clearing  BSY,  and  generating  an  interrupt.  If  the  drive  cannot  reach  cylinder  0,  it  posts  a
Track 0 Not Found error.

8.2.22 Security Disable Password (F6h)

The  SECURITY  DISABLE  PASSWORD  command  transfers  512  bytes  of  data  from the  host.  In  Table  6-6  it
defines  the  content  of  the  security  password.    If  the  password  selected  by  word  0  matches  the  password
previously  saved  by the  device,  the  device  shall  unlock  mode.  This  command  shall  not  change  the  Master
password. The Master password shall be reactivated only when a User password is set.

Table 8-7 Security password content

Word

Content

Control word.
Bit 0

Identifier 0= compare User password

1= compare Master

password
Bit (15:1) Reserved

1-16

Password (32 bytes)

17-255

Reserved

8.2.23 Security Erase Prepare (F3h)

The SECURITY ERASE PREPARE command shall be issued immediately before the SECURITY ERASE
UNIT command to enable device erasing and unlocking. This command prevents accidental loss of data on
the device.

8.2.24 Security Erase Unit (F4h)

This command transfers 512 bytes of data from the host. Table 6-7 defines the content of this information. If
the password does not match the password previously saved by the device, the device shall reject the

command with by abortion.