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Frustrum-Shaped Optical Disk and Mating Receptacle

IP.com Disclosure Number: IPCOM000114215D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Winarski, DJ: AUTHOR

Abstract

Optical drives, particularly CD-ROM drives, can have carousels which hold more than one optical disk or a plurality of trays, each of which holding one optical disk. It is possible for users to manually insert the single-sided optical media upside-down in either the carousel or the trays. This could cause a problems, as the optical drive can not perform I/O operations to the substrate side. The result would be a lot of drive activity to determine that the media was upside down. After a lot of drive error recovery procedures isolated I/O failures as resulting from an upside-down disk, the user would then have to get the optical media out of the drive, correct the upside-down disk, and try the whole process again. This would consume a lot of time.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Frustrum-Shaped Optical Disk and Mating Receptacle

      Optical drives, particularly CD-ROM drives, can have carousels
which hold more than one optical disk or a plurality of trays, each
of which holding one optical disk.  It is possible for users to
manually insert the single-sided optical media upside-down in either
the carousel or the trays.  This could cause a problems, as the
optical drive can not perform I/O operations to the substrate side.
The result would be a lot of drive activity to determine that the
media was upside down.  After a lot of drive error recovery
procedures isolated I/O failures as resulting from an upside-down
disk, the user would then have to get the optical media out of the
drive, correct the upside-down disk, and try the whole process again.
This would consume a lot of time.

      This article proposes geometric change to the single sided
optical disk 10 as well as to the carousel or tray 20 holding it.

      The receptacle in 20 which supports the optical disk would be
in the shape of a frustrum of a right circular cone.  A frustrum of a
right circular cone is a cone with its point sliced off.  At the
bottom of 20, there is a stabilizing lip 22.

      To mate with this frustrum-shaped hole in 20, the single-sided
media 10 would also be in the shape of a frustrum of a right circular
cone.  The result of this is that the optical media could be put in
the tray in only one orientation.  Upside-down single-sided optical
me...