Was: CD player (read) question for PB G4 644

[Tim Seufert]

On Mar 16, 2004, at 9:04 AM, Steve Milov wrote:

> Ok, it appears there is a device resources issue going
> on.  The PB G4 is a USB based device from what I
> understand, all the devices that are on the machine
> run on a USB.

Erm, no.  See:

http://developer.apple.com/documentation/Hardware/Developer_Notes/ 
Macintosh_CPUs-G4/PowerBook_G4_17Dec01/2Architecture/ 
Block_Diagram_and_Buses.html

You may have this later variant, which is not too different:

http://developer.apple.com/documentation/Hardware/Developer_Notes/ 
Macintosh_CPUs-G4/PowerBook_G4Apr02/2Architecture/Block_Diagram.html

The only internal USB device is the modem.

> I figured the hard drive is on the same address(?) as
> the CDROM or something like that.

The HD sits on its own ATA bus.  It can't have an address conflict  
because there aren't any other devices to have one with.

> The computer just went to sleep, when I woke it up the
> cdrom started to thrash again.  I also go the
> following error message:
> VFS: busy inodes on changed media.
>
> over and over again.
>
> Then followed by:
>
> I/O error: dev 0b:00, sector 112

This probably means your CD-ROM cannot read the disc.  It could be  
because the CD-ROM is broken, or because the disc is scratched up or  
otherwise problematic.  (Some CD-ROMs deal with damaged discs better  
than others, so even if the disc works fine in another reader that  
doesn't automatically mean your Powerbook's drive is broken.)