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Windows 7: diskpart clean zeros LBA 0 to LBA 2047

26 Jun 2014   #21
jumanji

Windows 7 Home Premium 32 bit
 
 

You are exactly right. If I use diskpart clean for boot related problems I will not be able to recover the partition just like in the other two cases that have come up recently.


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26 Jun 2014   #22
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

OK, then I guess we need to be cognizant of the formatting tool used.

Like Jumanji said, 2048 is much more common, presumably due to the prevalence of WDM as a formatting tool.

PW uses LBA 63, on the other hand.

What's the quickest way to determine if LBA 63 has been used? Or anything other than 2048?
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26 Jun 2014   #23
jumanji

Windows 7 Home Premium 32 bit
 
 

If you run bootice, it will show the start sector of all partitions.Please see my first post
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26 Jun 2014   #24
gregrocker

 

I am asking what damage Clean command can do when run to clear the boot sector and partition table to overcome Win7 installation failure. You said you would not run it with a LBA 63 start sector because of problems it could cause. What problems could a consumer experience who we advise to Clean their drive?
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26 Jun 2014   #25
jumanji

Windows 7 Home Premium 32 bit
 
 

Greg, I am asking again. What do you mean by installation failure? And how diskpart clean will resolve the installation failure?
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26 Jun 2014   #26
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Jumanji:

Here is wmic output on my drives.

Note that the starting offsets divided by the block size results in an answer of 2048 for 2 of the disks and 264192 for the other. All 3 at 2048 or later.

Can I assume these results are effectively what Bootice would tell me, at least for this specific issue?


Attached Images
diskpart clean zeros LBA 0 to LBA 2047-untitled-1.jpg 
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26 Jun 2014   #27
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by gregrocker View Post
What problems could a consumer experience who we advise to Clean their drive?
I assume he means at least that Clean on an LBA 63 formatted drive would prevent partition recovery.

Not a problem assuming you never would want to recover that partition.

He may mean more than that?
My System SpecsSystem Spec
27 Jun 2014   #28
jumanji

Windows 7 Home Premium 32 bit
 
 

I am out for a while.
My System SpecsSystem Spec
27 Jun 2014   #29
jumanji

Windows 7 Home Premium 32 bit
 
 

Quote   Quote: Originally Posted by ignatzatsonic View Post
Jumanji:

Here is wmic output on my drives.

Note that the starting offsets divided by the block size results in an answer of 2048 for 2 of the disks and 264192 for the other. All 3 at 2048 or later.

Can I assume these results are effectively what Bootice would tell me, at least for this specific issue?
Here is a picture of how Bootice shows my system drive. My system drive has three primary partitions and three logical in the extended partition.

As you can see all the partition details are available.

Start sectors of all NTFS volumes (Partition/Volume Boot Record) as well as the EBR (Extended Boot Record) are all shown.

diskpart clean zeros LBA 0 to LBA 2047-27-06-2014-20-16-28.jpg

If I have any problems with my Windows Installation, the solution is definitely not diskpart clean which will instantly make my system drive inaccessible. This will be the case with any one having the start partition on Sector 63. ( In my case I formatted the drive before installing Windows in 2009 to avoid the System reserved partition. Many have done that. In fact it was a hot topic then.)

Having said that I am still not clear what a "Windows Installation Failure" can occur, how it will manifest, and how will diskpart clean can only be the solution to resolve it. A technical explanation is required to be convinced.

If my Windows is still working albeit any problems, I shall only look for a solution other than diskpart clean. I have a backup of all these sectors and can restore them.


My System SpecsSystem Spec
27 Jun 2014   #30
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Jumanji:

Thanks for that. I'd never used Bootice before, but fumbled around with it.

Turns out the LBA info is also shown through the "Parts Manage" tab, which turns out to mean "partition manage".

As I suspected, for my 3 physical drives, it showed the same results as shown by the WMIC command I mentioned a few posts back: 2048, 2048, and 264192. So Diskpart Clean would be OK for me.

Just FYI, here's what Bootice shows for my 3 TB drive (GPT), with a single data partition:


Attached Thumbnails
diskpart clean zeros LBA 0 to LBA 2047-sector-edit-3-tb.jpg  
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