Abstract of INFO-MAC archived Text file
   'info/hdwr/apple-sony-drive-fix.txt'
  Uploaded 06/20/1992   9704 bytes

Subject: Added torque start-up ROMS for old Quantum drives (A) 
Date: Fri, 19 Jun 92 08:19:23 EDT 
From: Ephraim Vishniac <ephraim@Think.COM>


   A few weeks back, someone posted information suggesting that for
   those of us with old Quantum drives which appear to have problems
   starting when cold, there is a ROM update available.
   I would appreciate any specifics anyone has on this...

      SERVICE NOTICE: 20MB/40MB HARD DRIVE REPAIR EXTENSION PROGRAM

		   ( Copyright 1991, Apple Computer Inc.)
 
 
				 OVERVIEW
 
We have discovered that a certain batch of half-height internal 3.5" 20MB and
40MB hard drives and some external 3.5" 20MB and 40MB drives may have been
subjected to disk media contamination. These drives may experience a number of
different symptoms, as fully described later on in this notice. To address this
problem, Apple is offering a 20MB/40MB Hard Drive Repair Extension Program for
customers and Service Providers with drives manufactured four years ago or
later that meet all the criteria below. A new drive, P/N 661-1629, has been
substituted for the problem drives.
 

		     DRIVE IDENTIFICATION INFORMATION
 
		    * Definition of 20MB/40MB Symptoms
 
  * Stiction problems: Platter does not spin up after drive has been powered
    down for period of time.
  * Head crashes: Drive may or may not mount, and data may be corrupted.
  * Soft errors: Disk continually goes in and out of seek mode.
 
			* Model and Serial Number
 
The affected 20MB and 40MB drives were manufactured in Macintosh( SE, Macintosh
SE/30, Macintosh II, Macintosh IIx, Macintosh IIcx/IIci, and Macintosh IIfx
computers. The problem also affects some external 3.5" 20MB and 40MB
configurations. Additionally, these drives were used as Service repair modules
under P/N 661-0612 (20MB) and P/N 661-0464 (40MB). Because of the problem, all
new and existing orders for 20MB drives (P/N 661-0612) will automatically
receive a 40MB drive (P/N 661-1629).
 
If you have any questions regarding qualification of a failed 20MB or 40MB
drive, contact Technical Operations for further clarification.
 

		  * How To Identify Affected 40MB Drives