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>>> DiskUtil - a safer alternative to qunlock <<<

 
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BlueRanger is offline Old Post 12-16-2003 10:24 PM
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BlueRanger
New Member

Registered: Dec 2002
Location: London, England
Posts: 20

DiskUtil - a safer alternative to qunlock

Hi, I posted the attached DOS disk utility to the UK forum a few days ago. Since then I've modified it to make it safer to run on unlocked TiVo drives.

The program accepts four different commands:

1) DiskUtil/Info

Displays brief information about each IDE disk on your PC.

2) DiskUtil/TempUnlock DriveNo.

Unlocks a TiVo disk in the same way that a TiVo does during startup. The drive stays unlocked until power cycled or hard re-set.

3) DiskUtil/PermUnlock DriveNo.

Unlocks the disk so that, after a power cycle, it stays unlocked until replaced in a TiVo. I'm fairly sure this is the same method that qunlock uses. Unlike qunlock, the program checks if the drive is not already permanently unlocked before executing the command. This should avoid the problems with Maxtor drives when qunlock is run multiple times.

4) DiskUtil/Lock DriveNo.

Included for completeness. Locks the drive using the same keys as a Tivo. Drive will then respond to /TempUnlock and /PermUnlock as if it had just been removed from a TiVo.

Try it out. The source code is included so you can see how it works or modify it for your own requirements. No warranties or guarantees though - If you fry your drive you're on your own!

Dave

Attachment: diskutil.zip
This has been downloaded 3982 time(s).

__________________
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Airnet with Zoom card & external aerial

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ADent is offline Old Post 12-17-2003 10:21 AM
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ADent
TiVo Forum Special Member

Registered: Jan 2000
Location: Denver, CO
Posts: 1290

Thanx for the posting.

Has anyone tried this with a 120GB 2MB Cache Maxtor?

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cachecard_user is offline Old Post 12-28-2003 02:31 AM
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cachecard_user
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Registered: Dec 2003
Location: NYC
Posts: 240

it dosent work in an XP shell

diskutil /Info

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BlueRanger is offline Old Post 12-28-2003 05:57 AM
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BlueRanger
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Registered: Dec 2002
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No - it wouldn't. Both DiskUtil and qunlock are DOS utilities that make direct access to the disk hardware.

The only way to run both DiskUtil and qunlock is from a DOS boot floppy.

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nephilim is offline Old Post 12-28-2003 11:23 AM
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nephilim
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Hasn't it been repeatedly stated that booting Windows with a Tivo drive installed is a veeery bad idea? Granted I'm delusional, but the voices are seldom that specific.

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pahunt is offline Old Post 12-28-2003 02:55 PM
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pahunt
TiVo Forum Special Member

Registered: Apr 2003
Location: Somerset, England
Posts: 1526

quote:
Originally posted by nephilim
Hasn't it been repeatedly stated that booting Windows with a Tivo drive installed is a veeery bad idea? Granted I'm delusional, but the voices are seldom that specific.


Only if it's XP

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cachecard_user is offline Old Post 12-28-2003 04:10 PM
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cachecard_user
Senior Member

Registered: Dec 2003
Location: NYC
Posts: 240

Thumbs up

hey!

It works on maxtor 250 gig drive, sorry for doubting you

may I suggest a '/TempUnlock all' option for startup scripts. This utility should be standard on all tivo boot disks.

Last edited by cachecard_user on 12-29-2003 at 01:01 AM

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cachecard_user is offline Old Post 12-29-2003 01:04 AM
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cachecard_user
Senior Member

Registered: Dec 2003
Location: NYC
Posts: 240

quote:
Originally posted by nephilim
Hasn't it been repeatedly stated that booting Windows with a Tivo drive installed is a veeery bad idea? Granted I'm delusional, but the voices are seldom that specific.


Thank you. I actually was testing the utility on NON-TiVo maxtor drives using the /Info option.

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tholden is offline Old Post 03-02-2004 04:43 AM
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tholden
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Re: DiskUtil - a safer alternative to qunlock

Although I still don't understand what the hard drive does, whether it writes to the firmware or updates something on the hard drive when you issue this command, I appreciate the effort you made in creating this program. It is nice to at least understand what qunlock is doing. Thank you for your hard work.

quote:
Originally posted by BlueRanger
Hi, I posted the attached DOS disk utility to the UK forum a few days ago. Since then I've modified it to make it safer to run on unlocked TiVo drives.

The program accepts four different commands:

1) DiskUtil/Info

Displays brief information about each IDE disk on your PC.

2) DiskUtil/TempUnlock DriveNo.

Unlocks a TiVo disk in the same way that a TiVo does during startup. The drive stays unlocked until power cycled or hard re-set.

3) DiskUtil/PermUnlock DriveNo.

Unlocks the disk so that, after a power cycle, it stays unlocked until replaced in a TiVo. I'm fairly sure this is the same method that qunlock uses. Unlike qunlock, the program checks if the drive is not already permanently unlocked before executing the command. This should avoid the problems with Maxtor drives when qunlock is run multiple times.

4) DiskUtil/Lock DriveNo.

Included for completeness. Locks the drive using the same keys as a Tivo. Drive will then respond to /TempUnlock and /PermUnlock as if it had just been removed from a TiVo.

Try it out. The source code is included so you can see how it works or modify it for your own requirements. No warranties or guarantees though - If you fry your drive you're on your own!

Dave

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Robert S is offline Old Post 03-02-2004 08:18 AM
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Robert S
TiVo Forum Special Member

Registered: Jul 2002
Location: Cambridgeshire, UK
Posts: 9266

It doesn't alter the data on the hard drive platters, it interacts with the firmware that runs the drive controller.

These drives have a locking mechanism in the firmware that the Series 1 TiVoes activate.

The temporary unlock uses the same mechanism as the TiVo to release the lock for as long as the drive is powered.

The permanent unlock disables the lock (although the TiVo will re-enable it).

The problem is that with these new Maxtor drives, unlike the Quantum drives that were the original TiVo equipment, attempting to disable the lock when it's not already active engages it permanently. DiskUtil checks that the lock is engaged before it attempts to disable it. qunlock doesn't, which is why people destroy their drives with it.

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Joe Smith is offline Old Post 06-23-2004 02:41 PM
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Joe Smith
Medium Member

Registered: Aug 2003
Location: North Silicon Valley
Posts: 52

Re: DiskUtil - a safer alternative to qunlock

quote:
Originally posted by BlueRanger
Hi, I posted the attached DOS disk utility to the UK forum a few days ago. Since then I've modified it to make it safer to run on unlocked TiVo drives.
Dave



Thank you, thank you, thank you. I had a 120 GB Maxtor (6Y120P0) that
suddenly decided it was a 10 MB disk (Max LBA: 20000) after having been
run in a TiVo. Using "diskutil /PermUnlock 2" did the trick.

It appears that the factory default for these drives is the same as
TempUnlock, in that the lock will be applied after once being used in a TiVo.

-Joe

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alansh is offline Old Post 06-25-2004 04:23 AM
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alansh
Senior Member

Registered: Jan 2003
Location: Phoenix, AZ
Posts: 461

Either WinXP or Win2000 will have the problem with writing a signature to the disk, which ruins the TiVo boot sector. It has to do with the dynamic disk support.

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Robert S is offline Old Post 06-25-2004 07:17 AM
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Robert S
TiVo Forum Special Member

Registered: Jul 2002
Location: Cambridgeshire, UK
Posts: 9266

The problem that DiskUtil addresses isn't related to the WinNT signature (perhaps you're thinking of MakeTiVoBootable?).

I think the point was that you shouldn't run DiskUtil under a Windows NT environment - use Windows 9x DOS mode or a DOS boot floppy instead.

__________________
Please do not PM me asking for TiVo backups. I don't have any.

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