Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

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

02 Feb 2015   #31

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.

My System SpecsSystem Spec
02 Feb 2015   #32

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!
My System SpecsSystem Spec
02 Feb 2015   #33

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1

Quote   Quote: Originally Posted by whs View Post
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.

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.
My System SpecsSystem Spec

02 Feb 2015   #34
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.
My System SpecsSystem Spec

 Logical Drives disappear - how does this happen?

Thread Tools

Similar help and support threads
Thread Forum
Partition / Extended : Logical Drives
How to Create Extended Partition / Logical Drives Where Needed The Windows Master Boot Record (MBR) partition structure supports a total of only four (4) partitions per Hard Disk Drive / Solid State Drive, they can be either 4 Primary partitions or three (3) Primary partitions and a single (1)...
Logical partitions disappear upon reboot
Hi, Everytime I reboot my machine my logical partitions of the extended drive disappear. They re-appear only when I go to Computer management -> Disk Management and then do refresh drives. It is very frustrating as I have to do this for every reboot. Thanks, Pavan
Hardware & Devices
Partition / Extended : Logical Drives
Here's a new one. Partition / Extended : Logical Drives
Installation & Setup
How can i make logical drives in my system
I am using windows 7 Ultimate 64 bit OS......And My one is a 500 GB HD.........,How can i make logical drives in my system.?.............,whenever i try to make partitions during installation it is nt allowing either do to more than 4 primary partitions or to do logical partitions after my...
General Discussion
Last Logical Drives Dissapear
Hello Everybody I've bought this Sragate 500GB (Recognized as 465GB) HDD and moved everyhing into it. Partitioned it during 7 installation and here are my partitions all in NTFS: Primary (101MB) - NTFS - Created during Win7 setup - I'll delete when I'm ready to install a new OS Primary...
Installation & Setup

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 12:12.
Twitter Facebook Google+