I was using disk defragment on windows 7 and saw disk named


I only have 1 hard disk rest are partion c,d,e,f then this one. I don't see this one in my computer. I see this one in disk defragment. Then in disk management I see 1 disk and 5 partions. One of them just says 199 mb.

What is this volume thing? I read online saying it system recover but wanted to see what it is?


Right click on Computer, Select Manage, and then look down into Disk Management and you will see your partitions there.

When you run Disk Defragmenter, constrain it to just Drive C: , not all your drives. That will work for you

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  • So I see C,D,E,F and something called 199 mb ntfs. Is that 199 the ?Volume I saw in disk defragment? Or that odd name not showing up in Disk Managemt? Is it something for me to worry about like a virus? Also is there a way to get emails when a response is posted on this forum? Thanks! – Vick Jan 20 at 22:19
  • Yes, that is what you saw in Disk Defragmenter. It could be a recovery partition. So then that is why I say just point Disk Defrag to your main disk. Separately check your SE user profile to see if you can get emails. I rely upon notifications – John Jan 20 at 22:22
  • You said it could be a recovery partion. Could it be something else? Anyway to see what it is? – Vick Jan 20 at 22:25
  • Probably - depends on your particular machine, but viruses do not normally create partitions – John Jan 20 at 22:26
  • Sorry but anyway to find out if it's like a hack or something or just a system bootm Not great at computers but little help can figure things out. I saw email setting in SE changed it to 3 hrs see what that does. How do you do notifications? I use this on my mobile so do you have to be on computer and or leave site open? – Vick Jan 20 at 22:31

Unique Volume Names

Two factors can make it hard to reliably mount a specific volume at a specified volume mount point across operating system restarts. One factor is that two different volumes can have the same label, which makes them indistinguishable except by drive letter. The other factor is that drive letters do not necessarily remain the same. If a computer's administrator does not use the Disk Administrator to enforce drive letters, then drive letters can change as drives are removed from or added to the system.

To solve this problem, the system refers to volumes to be mounted with unique volume names. These are strings of this form:


This page has been updated see https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-volume

PS this is what a GUID (Globally Unique Identifier) looks like {D0445962-38B9-421B-B29D-3D440D4E04B5}, which is a text representation of a 128 bit number.

On this page is a script for making them - https://pastebin.com/QNAAMDNu.

If you make one on your computer you are pretty much guaranteed no one else will generate that particular number for a billion years or so (the earth gets swallowed by the sun before then). The advantage of this is that there is no central registry of GUIDs needed, so they are cheap. Contrast this to network cards that also have a unique number but the manufacturer has to buy numbers from a industry body.

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