The 800K floppies were double sided and required the hole to be covered. It didn't matter on my apple //gs, but the mac would assume they were 1.4 floppies and say they needed formatting. I believe OS 6 uses 800k floppies. If you want to use 1.4 floppies, you have to use OS 7 & up. Then both types are recognized.
--- On Thu, 9/24/09, Doug McNutt <[email protected]> wrote: From: Doug McNutt <[email protected]> Subject: Re: Formatting floppies To: [email protected] Date: Thursday, September 24, 2009, 9:53 AM At 09:34 -0700 9/24/09, jjv wrote: I am not quite sure, but I believe the hole in the upper left corner has to be covered with scotch tape. joe My SE/30 using 7.5 knows how to format double sided disks for HFS - well the last time I actually did it was a decade ago and it's possible that I changed the disk drive sometime before that. In general it's never a good idea to plug that second hole though. It's there to indicate the type of magnetic surface that the disk is made with. The official high density two sided disks require a higher magnetizing field than the single sided jobs and the drive needs to know that. If you tell the drive to treat a double sided disk as an older single side device it may wind up with its bits not fully saturated and subject to failure. But it's worth a try to see if the SE/30 really has a single sided drive in it. -- --> Halloween == Oct 31 == Dec 25 == Christmas <-- --~--~---------~--~----~------------~-------~--~----~ You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ -~----------~----~----~----~------~----~------~--~---
