🚀 go-pugleaf

In article <2481@netmbx.UUCP> hase@netmbx.UUCP (Hartmut Semken) writes:
>In article <769@snjsn1.SJ.ATE.SLB.COM> greg@sj.ate.slb.com (Greg Wageman) writes:
>>A while ago there was a posting stating that it is possible to write
>>on a disk with the write-protect hole open (write-protected).  Most of
>>us were skeptical, wanting to see schematics to know if this was, in
>>fact, possible.
>
>Whether this is possible or nor depends on the drive used.
>
>My Teac FD55F and Mitsumi 3.5 inch floppy do not write to
>write-protected disks.
>
>If I disconnect the -WR line from the drives to the ST and pull it up
>(10kOhms to +5Volts) on the ST side, the ST 'writes' to the disk, but
>rereading it displays an unchanged directory. Nothing really gets
>written.
>
>The read/write amplifier in the Teac is disabled by the internal
>WriteProtect signal. So it is not possible to write to write protected
>disks.
>
>Some NEC 1036 and 1037 do write to writeprotected disks (confirmed);
>my Aplle Disk ][ (with an Apple ][) does the same...

Yup, this is correct.

What fooled me was that the OS altered the *cache*, and when the write
to the disk failed, it didn't re-read the disk and update the cache.
A subsequent 'dir' command displayed the (erroneous) cache data.  The
file would have reappeared after a forced media change.

Sorry about that.


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