Holy Sh*t !!!!!!!!

[Nummi]

OH MY GOD. I am going to kill someone if I cannot fix this. I think TechTool caused this. Check the attachment to see the alert box. "This disk is unreadable by the Computer." My partition with OS 10.1.2! I think TTP is the problem starter. After I started up TechTool, it was "Auto Updating" some kind of files. I did not think it would hurt anything, so I let it run. HA! Does anyone know how I can get my OS X partition back? I checked to see if StartUp Disk could see it... not there. And, holding down the option key when booting up does not work, it never did work.

[Nummi]

I am not sure if this has anything to do with the problem... but I was listening to a CD with iTunes, and when I got to the end of the CD, iTunes crashed. I had to use Force Quit. Then I dragged the cd to the trash can... and it ejected... about 30 seconds later. then there was a system error. I think it said id=10. Something with a 10. I restarted... and then I got that error dialog box. (this all happened in OS 9)

[serpicolugnut]

Have you tried rebooting, zapping the PRAM and then seeing if the partition is visible?

[Nummi]

Yes... I did try rebooting... I did zap the PRAM. That did not help. And I tried to boot up without extensions. But it started with them anyway. Don't you just hold down the shift key?

[edX]

ok, first i will refer you to this thread documenting my own dealing with this message.

in addition, your box appears to be 9x, so if you have any other disk you can boot from, do so and see if you can launch from osx. or maybe that is what you are doing to send this?

you are using techtool 3.0.5, right? 3.0.6 should be out within a few weeks as well. sounds more likely itunes is at root of this than ttp.

it's not clear to me if you have any kind of second external drive, but it would come in handy about now if you do.

clean install of 9 might help you if this only happens in 9.

on the other hand, diskwarrior was best money i have spent in a long time as you might have gathered from the thread.

i truly empathize with you on this one!!

[chemistry_geek]

Try using OS X's Disk Utility program and try to repair the partition. I tried to repair mine once when the Mac OS 9 from the HD, a CD, and a ZIP disk would not recognize OS X on my other hard drive. Even though it could check the disk, it would not mount it. When I clicked to repair the disk, it said it could not be repaired, only verified, in which numerous nasty problems were found. I kept verifiying the hell out it. Then for some unknown reason, it was "fixed" and Mac OS 9 would allow me to select it as my startup disk. I lost nothing in OS X miraculously. I was REALLY sweating bullets, because my masters thesis was on it, and the HD was never backed up.

[Nummi]

I ran disk first aid on my missing volume. It found some errors. Check the link below to see the message. I have no idea what any of that means. Maybe one of you do. I have never heard of a BTree Header. and "MountCheck found serious errors just, scares me. I ran Disk First Aid twice. But nothing was fixed. I will run a few more times.

[chemistry_geek]

Nummi,

Try running the Disk Repair Utility from the Mac OS X Installation disk, or, if you're lucky, on the Mac OS X 10.1 upgrade CD. I tried like to hell to do it in Mac OS 9 with no success. When I ran the Disk Utility from the Mac OS X installation CD, it somehow was fixed, merely by verifying the hell out of it, and I say fixed with very weak arguments/support. The errors I see on your HD don't look as bad as what I saw on mine. I've seen the BTree Header error before, don't freak out, and don't re-initialize/format your HD yet, if a disk utility can "see" the disk, it should be repairable.