Date: Tue, 21 Dec 2004 15:10:24 -0500 (EST) From: Charles Sprickman <spork@fasttrackmonkey.com> To: Bram Van Steenlandt <brampie@no-wackos.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Mac UFS partition unreadable Message-ID: <Pine.OSX.4.61.0412211458290.598@oof.local> In-Reply-To: <41C5CF17.9010600@no-wackos.com> References: <41C5CF17.9010600@no-wackos.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, 19 Dec 2004, Bram Van Steenlandt wrote: > Hi, > > I use both mac and freebsd and would like to have the abbility to use my > external firewire drive on both plattforms. There is another way to do this, but it's a tremendous hack. That said, I've been doing it for more than two years... >From what I gather, the partitioning is the real issue. BSD can't read a OS-X partition "map" (for lack of understanding, I'll use that word), and vice-versa. Here's what I did... I had a large drive and I first ran disk utility under OS-X and left about half of the space unallocated. I went ahead with the normal HFS+ formatting. Then I ran "pdisk" under OS-X to see where the partition started and ended, same for the free space. I then moved the disk to FreeBSD. To grab all the OS-X labelling, I did "dd if=/dev/da0 of=osx-label count=6". Hold onto that file. Next I ran the BSD fdisk and disklabel. I took the OS-X start/end numbers and plugged those in and labelled that as unused in BSD. I then made a new partition with what was the "unused" area of the drive under OS-X. I then ran the following command: "dd if=/dev/da0 of=bsd-label count=1" and saved that file. So the disk at that point could be mounted under FreeBSD. But if you take it back to OS-X, no-go, since it can't make heads or tails of the label. To make this vaguely usable, I "switch" the disk from one "mode" to the other. So if I've been using it under FBSD and want to use it on the Mac, after unmounting it, I do: "dd if=os-x-label of=/dev/da0" Then if I unplug it and throw it back on the Mac, all is well. When I want to use it on FBSD, before mounting I do: "dd if=bsd-label of=/dev/da0" And then it mounts. Very hackish, but the only thing I could find. I thought about FAT32, but since I needed to have HFS+ stuff on there that requires resource forks and other oddities on the Mac side, and on the BSD side I needed real perms, FAT32 didn't cut it. YMMV, all that is from memory, but you get the gist of what's going on... Charles > This should be possible because both are BSD and both can use UFS. > However when I plug an freebsd formatted drive into my mac he is rather > confused by first saying that he can't read this drive and I should format > it. Then when I try to mount it from the terminal he complains about the > superblocks, when I run some utils they sometimes say they can't determine > the partition type, also when I look into /dev there is nothing that > indicates that this drive has partitions. > > So I formatted the drive on my mac into UFS. Same thing happens on freebsd. I > did some googling and it appears to be so that this could be because of > little vs big endian. I am however rather new to freebsd and have no idea > what the difference is. > > So what can I do to have a drive readable to both OSes ? > note: > drive is 160 Gig seagate > mac is running 10.3.5 > freebsd is amd 64 5.3 RELEASE > > mac supported disk formats are > MS-DOS,UFS,HFS,HFS+ > I now that HFS or MS-DOS would work but then I have no support for 160 gig / > long filenames > > I'm out of inspiration > > Thanks In advance > > Bram > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.OSX.4.61.0412211458290.598>