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Windows 7: Unallocated 7.84 mb space materializes (from Outer Space?)

06 Feb 2011   #1
Puddin Man

Win7 Home Prem. 64 OEM
 
 
Unallocated 7.84 mb space materializes (from Outer Space?)

Hi,

I went to a lot of trouble to consolidate the 100 mb (BCD/bitlocker etc) partition that Win7 unexpectedly created when I installed 7 some months ago.

Since then I've configured a 7/XP as multi-boot system and thought it was stable. C: stored 7, D: stored XP, and there were 2 additional partitions.

Tonight Partition Wizard (bootable) tells me there is an unallocated 7.84 mb logical partition occupying sectors 0-16064. Neither 7 nor XP reports the existence of this space.

Definite details about the origin of such a storage mystery would be much appreciated.

Thx,
P


My System SpecsSystem Spec
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07 Feb 2011   #2
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Sounds like a partition alignment problem, as sectors 0-16064 are normally the first track on a hard disk.

Update on V4 progression

Did you ever have a Linux partition on that computer?
My System SpecsSystem Spec
08 Feb 2011   #3
Puddin Man

Win7 Home Prem. 64 OEM
 
 

Quote   Quote: Originally Posted by TVeblen View Post
Sounds like a partition alignment problem, as sectors 0-16064 are normally the first track on a hard disk.

Update on V4 progression

Did you ever have a Linux partition on that computer?
Never.

I built the system last May. Installed W7-64 Home Prem. , then XP (multi-boot), and added 2 data partitions. A second identical HD stores a bit-for-bit copy of what is on the first.

P
My System SpecsSystem Spec
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08 Feb 2011   #4
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

I *think* Partition Wizard (Bootable CD) will correct that. Although I have not done so personally.
My System SpecsSystem Spec
08 Feb 2011   #5
alphanumeric
Microsoft MVP

Windows 8.1 Pro with Media Center 64 bit
 
 

Windows XP leaves a very small unallocated space on the hard drive during its install. Its reserved for data related to making the partition part of a dynamic disk. If memory serves me right its around 8 megs on my XP PC. It also doesn't show up in Disk management on my XP PC but I know its there.
My System SpecsSystem Spec
08 Feb 2011   #6
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

So Alpha - best for OP to leave it alone?
My System SpecsSystem Spec
08 Feb 2011   #7
diehrd

Ultimate 7
 
 

Alpha is dead on , I would leave it alone
My System SpecsSystem Spec
08 Feb 2011   #8
alphanumeric
Microsoft MVP

Windows 8.1 Pro with Media Center 64 bit
 
 

I always just left it, its only ~8 megs. I couldn't be bothered loading a third party partitioning app just to get ride of it. Once you installed XP it was out of site out of mind anyway. I just noticed that during the XP install, even if created a new partition, there was always this little bit left over. That got me curious so I did some digging to figure out what it was for. I don't think anything would happen if you recovered that space, unless you tried to setup a dynamic disk. Thats not something I think to many people do these days. Its up to you if you want to nuke it, just don't blame me if bad things happen.
My System SpecsSystem Spec
08 Feb 2011   #9
Puddin Man

Win7 Home Prem. 64 OEM
 
 

I appreciate your responses, and have heard of the dynamic-disk thingness before, but ...

The problem is not what to do with the 7.84 mb space, but rather determining where it came from.

Around 06-01-2010 I installed Win7 and was amazed to find it had written the first partition of 100mb (BCD, bitlocker, etc). It cost lots of time to find out what it was and consolidate it into the functional Win7 partition. Acute Heartburn!

By 08-11 I was certain that I wouldn't place primary reliance on Win7, so I spent lots of time learning about Win7/XP multi-boot, then installed XP as the 2nd partition. It did not create the 7.84 mb space.

The thing is, I need total control of what is stored on my HD's in order to specify and execute my backup strategy. I suppose I'm kinda "old school" in that it flat-out boggles my poor brain that *any* software product would write some unknown and unspecified (to the user) storage entity to a HD. Even worse that it would hide it from common program facilities like "Disk Management".

So, I'm just after control. Where did it come from? How can I prevent it from re-appearing?

Thanks,
P
My System SpecsSystem Spec
09 Feb 2011   #10
diehrd

Ultimate 7
 
 

SYMPTOMS
During Setup, if you choose to create a partition that uses the remaining space on a disk, you cannot use the maximum space available on the disk.

For example, if you choose to create a 4096-MB partition on a disk that has only 4096 MB available, the actual partition that is created may be 4095 MB or less in size.

CAUSE
Some space at the end of the disk is reserved by Setup in case you later want to upgrade the disk to a dynamic disk. Dynamic disk information is saved at the end of the disk. The amount that is reserved is a minimum of one cylinder, or 1MB, whichever is greater. One cylinder can be up to 8MB, depending on drive geometry and translation.
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 Unallocated 7.84 mb space materializes (from Outer Space?)




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