Bizarre drive volume mystery

[Calvus]

I go to do a manual defrag because reasons and I see this mysterious, to me, drive volume. Can anyone tell me wtf this is?
I have not set up any partitions intentionally and this is Win 10.

[Azulath]

Does diskpart tell you anything more specific?

[blaxa]

It seems like you're seeing the Drive GUID instead of the NTFS Volume name.

Open CMD and run 'mountvol'. Do you see the volume there as well? Windows may have assigned the drive that name (which is the "Real" name of the drive) because of a letter conflict or storage issue.

What happens if you use Diskpart to assign it a new letter?

[Gamebase1]

Sidenode:
Defragging and SSD does more damage then good. And do you have 2 ssd and 1 hdd in the system? If you have 1 SSD and 1 HDD that unknow partition is the system partition, and you don't whant to defag that....

Otherwise do you have an dock connected?

Otherwise check diskpart and see if you have some other partitions that are not mounted or RAW.

And do you have Linux or OS X of some sort instlled?

[Calvus]

It shows up when I run mountvol.

I'm an end user and don't know the ins and outs of using the CMD shell.

I d/c'd my phone and the volume is still there in the defrag menu.

No other OS installed at this time.

I have a M.2 ssd, sata ssd and a HDD. No other drives installed.

I tried to assign e: but I must be doing it wrong.

[blaxa]

Try:
DISKPART

LIST DISK
SELECT "DISK #"
LIST VOLUME

Do you see your volume with the odd name? When you find it:
assign letter=R

Let me know if that does anything.

[Decheka]

That's the system volume from what I recall. EDIT: System reserve volume.

[blaxa]

System reserve volume

Sounds about right.

What is a Microsoft Reserved Partition (MSR)?

The Microsoft Reserved Partition (MSR) reserves space on each disk drive for subsequent use by operating system software. GPT disks do not allow hidden sectors. Software components that formerly used hidden sectors now allocate portions of the MSR for component-specific partitions. For example, converting a basic disk to a dynamic disk causes the MSR on that disk to be reduced in size and a newly created partition holds the dynamic disk database. The MSR has the Partition GUID:
DEFINE_GUID (PARTITION_MSFT_RESERVED_GUID, 0xE3C9E316L, 0x0B5C, 0x4DB8, 0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)

What disks require an MSR?

Every GPT disk must contain an MSR. The order of partitions on the disk should be ESP (if any), OEM (if any) and MSR followed by primary data partition(s). It is particularly important that the MSR be created before other primary data partitions.
Who creates the MSR?

The MSR must be created when disk-partitioning information is first written to the drive. If the manufacturer partitions the disk, the manufacturer must create the MSR at the same time. If Windows partitions the disk during setup, Windows creates the MSR.

Why must the MSR be created when the disk is first partitioned?

After the disk is partitioned, there will be no free space left to create an MSR.

How big is the MSR?

When initially created, the size of the MSR depends on the size of the disk drive:
On drives less than 16GB in size, the MSR is 32MB.
On drives greater than or equal two 16GB, the MSR is 128 MB.
As the MSR is divided into other partitions, it becomes smaller.

[blaz1120]

I thought "optimize" in windows 10 runs trim or something like that. Didn't they remove defragging for ssd's in w10?

[Gamebase1]

http://www.hanselman.com/blog/TheRealAndCompleteStoryDoesWindowsDefragmentYourSSD.aspx

As far as Microsoft states, they do defrag your SSD, but intellegenty. And also peform an RETRIM operation at some time to prevent the TRIM queue getting ful. But TRIM is enqbled by default, and ou can enable defrag on your ssd if you believe in The Microsoft Storage Engneer listed in this article.

But as I see so far, this topic screems for further investigation...

[blaz1120]

It seems that window doesn't do anything harmful. I'll just leave it on.

[Gamebase1]

Sems faire, but still. Im not fully shure.