[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: cdrom as slave



> 
> On Mon, 26 May 1997, Doron Zifrony wrote:
> 
> > > can i configure an atapi ide cdrom to work in linux as slave?
> 
> > Generally speaking (leaving Linux aside) not all the combinations of IDE
> > disks and ATAPI CDs are legal.  For example, a slave can't be configured
>                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
> > in itself on the same IDE controller without a master.
>             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   I have a hard disk as hda, nothing as hdb and hdc and the CD-ROM drive
> as hdd.  The controller is the on-board circuit of my Tyan motherboard.
> 
>   So, a master without slave on the first channel and a slave without
> a master on the second channel.
> 
> alex
> 
> 

Are you sure that the CD-ROM is configured as a slave.  It is permissable,
according to the standard to have one IDE disk on the primary cable and
an ATAPI CD-ROM on the secondary cable, when it is the master on the second
cable.

The ATA standard (ANSI X3.221-1994), which I look at now specifies that
, and I quote, "When a single drive is attached to the interface it shall be
set as Drive 0". (The interface is the IDE interface, and Drive 0 is the
master).  That means that ATAPI put aside, you can't connect a single SLAVE
drive to an IDE (aka ATA) interface.  

That doesn't say anything about the way Linux decided to choose drive names.
It is possible that Linu device drivers, for some reason, decided to skip
hpb or hpc.  I don't know.  However, the configuration you have specified,
where you have a single ATAPI CD-ROM as a slave on the second ATA cable
without a Master on that cable is simply non conformant with the ATA standard.


-- 
Doron Zifrony                1 Oranim Str.          Tel: 972-3-5304324
Data General Technology      Givat Shmuel 51905     Fax: 972-3-5325917
                             Israel              E-Mail: doron@jaguar.dgt.co.il
Disclaimer: The opinions expressed hereby are my personal opinions.


Follow-Ups: References: