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

[Jeffrey Paul Burger]

Thanks!... And I'm still in trouble. Here's what I get from pdisk:

Partition map (with 512 byte blocks) on '/dev/sda'
 #:                type name        length   base      ( size )
 1: Apple_partition_map Apple           63 @ 1
 2:     Apple_Bootstrap untitled      2048 @ 64        (  1.0M)
 3:     Apple_UNIX_SVR2 untitled 394009666 @ 2112      (187.9G)
 4:     Apple_UNIX_SVR2 swap       4080510 @ 394011778 (  1.9G)
 5:     Apple_UNIX_SVR2 untitled    204800 @ 398092288 (100.0M)

Device block size=512, Number of Blocks=398297088 (189.9G)
DeviceType=0x0, DeviceId=0x0

pdisk: Bad data in block 2 from '/dev/sdb'
pdisk: can't open file '/dev/hda'  (No medium found)

Somebody off-thread speculated that " it could be with the uid.  HFS doesn't
have the same ownership/permissions structure and the default is that only
root can write, but you can change this with mount options such as user,
umask, uid, etc." Unfortunately, this doesn't mean much to me though. But
since  to mount the errant disk still give me "Wrong fs type, bad option,
bad superblock on /dev/sdb or too many mounted filesystems", I'm thinking
that I somehow told it that the file system is not HFS+... in which case I'm
hoping that there's some way to tell it that it is indeed HFS+ and access
the data again. 

Any and all help is greatly appreciated!

Thanks!

Jeff

Date: Thu, 1 Dec 2005 23:47:52 -0500
From: Eric Dunbar <eric.dunbar at gmail.com>
Subject: Re: [ydl-gen] Re: HFS+ mount is read only -- how to make RW?
    (YDL    4.0.1)
To: Yellow Dog Linux General Discussion List
    <yellowdog-general at lists.terrasoftsolutions.com>
Message-ID:
    <77520bee0512012047m2b611949oa17aa9b3adcb6954 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

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