Browse Prior Art Database

Improved Compact Disk-Read Only Memory Boot

IP.com Disclosure Number: IPCOM000116806D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Asensio, M: AUTHOR [+4]

Abstract

Disclosed is a mechanism for booting a system from a Compact Disk-Read Only Memory (CD-ROM) disk, using a disk management technology called "mirroring," through which the system can redirect file operations to a different path. This redirection can be performed on a file, disk, or path basis.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Improved Compact Disk-Read Only Memory Boot

      Disclosed is a mechanism for booting a system from a Compact
Disk-Read Only Memory (CD-ROM) disk, using a disk management
technology called "mirroring," through which the system can redirect
file operations to a different path.  This redirection can be
performed on a file, disk, or path basis.

      To boot the system from CD-ROM, firmware running on the system
first loads the CD-ROM bootstrap image.  The operating system is
loaded up to the point at which the hard disk preparation and disk
mirroring can take place.  At this point, the operating system does
not require write access to any file on the CD, and paging is not in
effect.  Next, a hard disk preparation utility is loaded as part of
the boot sequence.  This utility partitions and formats the hard
disk.  Then, the CD-ROM device is mirrored to a path on the
newly-prepared disk.  From this point on, the CD-ROM device appears
to the system to be a read/write device, as any attempted writes to
the CD are redirected to the hard disk.  Paging is enabled, and the
boot process is allowed to continue.  When this process is complete,
a fully functional operating system is available to the user, running
from the CD-ROM device.  From this point, the user may run any
application, including the Install program.

      Thus, the operating system is booted only once, while
"mirroring" is used to handle attempts of the system to write to the
CD-ROM.  Only one...