[ydl-gen] Re: HFS+ mount is read only -- how to make RW? (YDL 4.0.1)

[Eric Dunbar]

Hmm. Not good, but, maybe there's hope.

Ok, I ain't no expert on partitions but shouldn't you have a number to
go along with your sdb?

In your case, you're on the SCSI bus (right?) and are on the second
drive (ergo b). Take a look at your partition table using pdisk
(/sbin/pdisk -l /dev/sdb). What does it say?

In my case my drive resides at hdc and the relevant HFS+ partition is
#7. So my mount command would be:

mount /dev/hdc7 /mnt/macosx -t hfsplus

So for you it would be something like:
mount /dev/sdb# /mnt/macos -t hfsplus

I would strongly recommend that you do things read-only until you've
got the problem licked:

mount/dev/sdb# /mnt/macos -r -thfsplus (NOTE: the space doesn't make a
difference)

Also, /mnt/whatever is merely your "mount point". You have a "real"
directory (/mnt/whatever) on your drive and you reference another
volume to that mount point when you mount the other volume.

Thus, doing hpmount /mnt/macos would do nothing.

PS I'm guessing that hpmount didn't like the fact that you referenced
your _whole_ drive.

Good luck.

Eric.

On 12/1/05, Jeffrey Paul Burger <jeff at sedona.net> wrote:
> Red Alert! Now I've lost access to my HFS+ drive from both Linux and OS X!!!
> Help!!!
>
> Background: This is a dual boot G5 running YDL 4.0 and OS 10.4. I'm a Linux
> newbie. A friend (who no longer lives where I do) gave me the magic to mount
> the Mac OS disk from YDL at /dev/sdb, so that's the destination I've been
> using. And I have a "macos" folder in my mnt directory. Until now, I've been
> successfully mounting and reading from the HFS+ drive using "mount /dev/sdb
> /mnt/macos -t hfsplus". (Strangely, until I corrected it today, the exec
> file my friend wrote was missing a space:  "... -thfsplus" and it still
> mounted and read.) Anyway, the problem came when trying to follow
> instructions from this thread to enable writing to the HFS+ disk from YDL as
> well.
>
> Pursuant to earlier messages in this thread, I found hfsplus on my system
> and invoked in. The man page essentially says:
>
> hpmount [...] source-path
>
> Not knowing whether source-path meant /mnt/macos or /dev/sdb, I tried both.
> I know that hpmount /dev/sdb gave me the following message (hpmount
> /mnt/macos may have been identical but I can't be sure now):
>
> "Warning. You are about to open /dev/sdb for writing. Are you sure you want
> to do this (y/n)?"
>
> I responded affirmatively and received:
>
> "hpmount: Neither wrapper nor native HFS+ volume header found (unknown error
> 4294967295)"
>
> I went ahead anyway with the usual "mount /dev/sdb /mnt/macos -t hfsplus"
> and received:
>
> "Wrong fs type, bad option, bad superblock on /dev/sdb or too many mounted
> filesystems"
>
> After trying several variations on this theme (and getting the same error
> messages), I decided to see if I could boot from that volume normally under
> OS X. After the initial switch screen for Linux vs. OS X, followed by the
> gray Apple logo on the white screen, the logo is replaced with a large gray
> international symbol for "no" (circle with a slash across it). And the
> circular progress meter below just spins forever.
>
> So I now have two problems: 1) how do I get my OS X boot drive back? 2) what
> did I do wrong (or what do I need to do right) to access this drive from YDL
> once it's resurrected?
>
> Any and all help is greatly, greatly appreciated. And please keep in mind
> that I only know enough to make myself dangerous (obviously!) and clear
> explanations are very helpful.
>
> Thank you!
>
> Jeffrey