Re: [linux-minidisc] Building himdformat against libscg on MacOSX

[Michael Karcher <Michael.Karcher@fu-berlin.de>]

Am Freitag, den 21.05.2010, 23:47 +0200 schrieb Adrian Glaubitz:
> Ok, it was set to 0x00 but that didn't work with the 1GB medium when I
> tried. Are you sure that it shouldn't be:
> 
> * Format - 0x00
> * Erase -  0x01
> 
> where "Format" works on 60/74/80 min media only and "Erase" works on
> 1GB media as well?
No. The Terms might be confusing, but this is how Sony called it in
their library they linked into Hi-MD Music Transfer Software for the
Mac. The idea of "erase" is that the traces of any Hi-MD structure are
completely erased, and the idea of "format" is that the medium contains
data in the right format to store Hi-MD tracks.

To add confusion, the operation executed by the "Format" command (C2/01)
is named "Erase All" in the Walkman menu, and the operation executed by
the "Erase" command (C2/00) is called "Format" in the walkman menu and
also only available on classic media.

> I have committed the changes to the code according to your
> information. I didn't test the changes yet, however. I might test that
> tonight to confirm.
I think we should only use the "format" opcode, i.e. C2/01. The complete
blanking is only useful if you want to reuse a MD medium in a non-Hi-MD
device. Maybe offer it as extra option.

> Btw, what do you guys think on implementing playback control in
> QHiMDTransfer once we got sending SCSI commands working?
Shouldn't be much of a problem. But this is not what sfbp requested in
the channel recently. He talks about reading the tracks via USB,
decoding them (regardless of what DRM says) and sending them to the
sound card in real time. This means the Hi-MD DRM needs to be cracked
for that.

Regards,
  Michael Karcher