System 6 will use HD floppies just fine. I use them all the time in my 
Classic.

Besides, the SE FDHD was released a good couple years before System 7. 
You can bet Apple wouldn't have left nearly doubling the capacity of 
floppies to software unavailable for two years.

Scott

jjv wrote:
> 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  <--
>
>
>     >



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