Browse Prior Art Database

Method to Set a Hibernation Flag in a Hard Disk

IP.com Disclosure Number: IPCOM000117809D
Original Publication Date: 1996-Jun-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Fukui, M: AUTHOR [+3]

Abstract

Disclosed is a method for setting/resetting a flag indicating a state of hibernation in a hard disk of portable Personal Computers (PCs), which enables system software (such as Power-on Self Test or Power On Self Test (POST)) to identify the hibernation state in its early stage, and allows the POST to execute minimum tasks needed for the wake-up (resume from the hibernation mode) and minimize its execution time, even if the hard disk is locked by security measures such as a hard disk password by an operator.

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This is the abbreviated version, containing approximately 52% of the total text.

Method to Set a Hibernation Flag in a Hard Disk

      Disclosed is a method for setting/resetting a flag indicating a
state of hibernation in a hard disk of portable Personal Computers
(PCs), which enables system software (such as Power-on Self Test or
Power On Self Test (POST)) to identify the hibernation state in its
early stage, and allows the POST to execute minimum tasks needed for
the wake-up (resume from the hibernation mode) and minimize its
execution time, even if the hard disk is locked by security measures
such as a hard disk password by an operator.

      In a portable PC which supports a hibernation function and has
a removable hard disk feature, a "portable" hibernation can be
supported.  It means that if a system goes into hibernation mode, the
hard disk can be removed from the system, and can be plugged in
another system with the same configuration, and then the system can
wake up from the hibernation mode just as if it wakes up in the
original system.  In such a hibernation design, the flag which
indicates the hibernation state must be recorded in a data area of
the hard disk.  However, if the hard disk supports a security lock
mechanism such as a hard disk password which prohibits any access to
the hard disk data area until the password is typed by an operator,
and if the password is installed, the hibernation flag written in the
data area can not be read until the password is unlocked at the
password prompt.  Usually, the password sequence is executed at the
end of the POST process, so that the POST could not identify the
hibernation state until its last stage.  Therefore, the POST had to
execute the same pro...