Atari STart Magazine Cover Disks

Backstory:

STart Editorial introducing the Heidi Format

STart magazine ran from Summer of 1986 to April/May 1991. It usually used single-sided disks, but in November of 1989 they switched to a double-sided format but using a special bootsector that made them look like single-sided disks.

This is called the "Heidi Format", and they explain it in an Editorial note.

But the end result is that these disks are double-sided, but disk imaging software may mistake them for single-sided. This happened when all the STart disks were imaged, so existing collections of the disks are actually missing half the content.

I'm trying to organize locating and re-imaging these affected disks.

Issues affected:

Date	Volume/Number	Affected?	Reimaged yet?	Notes
October 1989 & earlier	Vol 4 No 3	No	Not needed
November 1989	Vol 4 No 4	Yes	No	The first issue affected.
December 1989	Vol 4 No 5	Yes	No
January 1990	Vol 4 No 6	Yes	No
February 1990	Vol 4 No 7	Yes	No
March 1990	Vol 4 No 8	Yes	No
April 1990	Vol 4 No 9	Yes	No
May 1990	Vol 4 No 10	Yes	No
June 1990	Vol 4 No 11	Yes	No
July 1990	Vol 4 No 12	Yes	No
August 1990	Vol 5 No 1	Yes	No
September/October 1990	Vol 5 No 2	Yes	No
November 1990	Vol 5 No 3	Yes	No
December 1990	Vol 5 No 4	Yes	No
January 1991	Vol 5 No 5	No?	No	It's not certain if the January 1991-April/May 1991 issues are affected
February/March 1991	Vol 5 No 6	No?	No
April/May 1991	Vol 5 No 7	No?	No	Last issue.

External Links:

• My twitter thread explaining the issue
• Atari Forum thread about the issue
• Collection of existing disk images
• Internet Archive collection of STart Magazine issues
• AtariMania collection