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Windows 7: Logical Drives disappear - how does this happen?

02 Feb 2015   #31
dsperber

Windows 7 Pro x64 (1), Win7 Pro X64 (2)
 
 

Quote   Quote: Originally Posted by TVeblen View Post
This is what the disk looks like in it's normal condition (current, repaired):

Attachment 348358

And this is similar to what it looked like when it had the problem:

Attachment 348359

The only difference was the first 14GB Recovery Partition was there, and the Free Space box listed 351.30GB of free space.
Doesn't really shed any more light on exactly how it happened, but the second screenshot shows that the extended partition's boundary was recognized (note the dark green outline around the bright green "free space"). The extended partition is one of the possible max of four primary partitions defined through the "boundary box" at the front of the drive, so this suggests there was no damage done to the low/high sector values in the "boundary box" for this partition. It's still defined, and it's still recognized as an extended partition, and it's still there.

But since there are no logical partitions shown inside of that dark green extended partition, and that the entire area is shown as bright green "free space", if this is where the two previously known logical partitions used to live, it suggests that the corruption (or damage or reset or whatever caused it) was to the internal logical partition definition area inside of the extended partition itself. Somehow, the low/high limits of the two logical partitions inside the extended partition got erased or reset to the same initial state it would have when no logical partitions have been defined but one or more actually did exist at one time (so that the extended partition would have been created).

Anyway, still very interesting. Can't imagine how this type of very specific reset/delete of the very specific previously existing logical partition boundary definitions could occur "naturally" on its own without the involvement of some program (like DISKMGMT or Partition Wizard) that understands about partitions and how/where the low/high limits are specified.

Very odd.


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02 Feb 2015   #32
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Odd indeed!

I must admit that I've seen folks post similar problems where I have been guilty of thinking: "well, you had to have done something. These things don't just happen".
Now I know better!
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02 Feb 2015   #33
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Quote   Quote: Originally Posted by whs View Post
Quote:
So that raises the question: if KLap was connected to CHLOE and accessing a shared folder on it, and KLap was shut down without closing Windows Explorer, could that action cause the corruption that messed up the File Table?
A shutdown from another system should not corrupt the MBR - even if the drive was open. It is supposed to be an orderly process. But then you never know. We'll have to find someone who is familiar with the disk management internals.
Granted.

The system also should not lose the connections to network computers and shared folders in the Homegroup either.
Both problems happening so close to one another leads me to conclude that they must be related. Just can't think of how.
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02 Feb 2015   #34
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Well, homegroup is another iffy area. With homegroup and on the high seas you never know what happens, LOL.
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 Logical Drives disappear - how does this happen?




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