HFS filesystems read/write

[Tommy Trussell]

On Sun, 07 Nov 2004 02:15:31 +0100, Carlos Perelló Marín
<carlos.perello at canonical.com> wrote:
> Could you look at the output related to HFS+ from the dmesg command just
> after mount the volume?
> 
> If you read something like it needs to run fsck and mounting as
> readonly, you have two options:
> 
> 1.- Check it from MacOSX
> 2.- Use hfsplus tools (hpmount your device and then, hpumount)
> 
> That way the incorrect umount flag will be reset and you will be able to
> mount it again as read/write.
> 
> The best option is the MacOSX one because I think hpmount/hpumount just
> resets the flag without checking the filesystem.

He DID say HFS in the original message -- I'm running mol with OS9 on
this Mac and made the MacOS boot volume HFS+ only because I ran out of
room otherwise...

anyway I just wanted to interject that the OS may be detecting a
filesystem problem but I don't think you can fsck an hfs file system
from linux.... the hfsplus tools has a utility that claims to do
hfsplus -- hpfsck -- but from what I've read I would be very wary of
letting it try to "fix" anything.

If this is HFS and if you can  boot Mac OS I would run Disk First Aid
on the volume and see if it reports any problems. Especially if dmesg
contains complaints after the mount -- that could explain why it says
it's being mounted rw but switched to ro.