Re: [linux-minidisc] Differences between 1GB HiMD and Standard MD in HiMD-Format

[Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Hi,

On Thu, Apr 29, 2010 at 12:14:13AM +0200, manner.moe@gmx.de wrote:
> Hello,
> as you know, i am testing scsi support for libhimd with libusal.
> I successfully implemented "allow/prevent removal", "himd format",
>  "get disc id",  "get time" and "set time" yet.

That sounds great. I should finally get libusal working on MacOS, so
we can finally get all this stuff into QHiMDTransfer. I'm sorry for
the delay, I'm just a bit busy finding a job ;).

> 1.  1GB HiMDs have a fixed disc id. It doesn´t change.
> (...)
> 3.  disc ids on standard MDs changes every time the MD is 
>      inserted. So if i eject a MD and reload the same MD both disc ids
>      will change (the one we get from mclistxx.hma file and the one 
>      we can read per scsi command) but both are the same.
>      (on blanc discs, as i wrote above)

I think we already discussed that somewhere but I'm not sure. At
least, it doesn't sound unfamiliar to me. I think the reason is simply
that standard MDs were originally not designed to be used for HiMD
storage and thus they don't provide extra sectors on the disk to store
the disk ID. The disk ID is supposed to be unique and HiMD were
designed with that concept in mind, so that's why their IDs never
change.


Adrian