What is this unmounted drive?


P

PeterL

Well-known member
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Windows 11 64bit
WINver 21H2
 

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My Computer My Computer

At a glance

Windows 11 64bit3.70 gigahertz Intel core i7-8700K16GBNvidia GTX 1050
OS
Windows 11 64bit
Computer type
PC/Desktop
Manufacturer/Model
Bespoke
CPU
3.70 gigahertz Intel core i7-8700K
Motherboard
MSI 7B22
Memory
16GB
Graphics Card(s)
Nvidia GTX 1050
Sound Card
on board
Monitor(s) Displays
Dell 27" Ultrasharp
Screen Resolution
2560 x1440
Hard Drives
Drive c: 1tb SSD
DriveD: 1TB SSD
DriveE: 2tb HDD
External drive Samsung T7 2TBSSD
Cooling
no
Internet Speed
52MB/sec
Browser
Chrome
Antivirus
MalwareBytes & Microsoft Defender
I had a similar thing happen to me, the fault with mine though was just simply a loose cable to that drive in particular.
 

My Computer My Computer

At a glance

Windows 11 Pro 25H2
OS
Windows 11 Pro 25H2

My Computers My Computers

System One System Two

  • At a glance

    Win 11 Home ♦♦♦26200.8737 ♦♦♦♦♦♦♦25H2AMD Ryzen 7 3700XG.Skill (F4-3200C14D-16GTZKW)EVGA RTX 2070 (08G-P4-2171-KR)
    OS
    Win 11 Home ♦♦♦26200.8737 ♦♦♦♦♦♦♦25H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Built by Ghot® [May 2020]
    CPU
    AMD Ryzen 7 3700X
    Motherboard
    Asus Pro WS X570-ACE (BIOS 5302)
    Memory
    G.Skill (F4-3200C14D-16GTZKW)
    Graphics Card(s)
    EVGA RTX 2070 (08G-P4-2171-KR)
    Sound Card
    Realtek ALC1220P / ALC S1220A
    Monitor(s) Displays
    Dell U3011 30"
    Screen Resolution
    2560 x 1600
    Hard Drives
    2x Samsung 860 EVO 500GB,
    WD 4TB Black FZBX - SATA III,
    WD 8TB Black FZBX - SATA III,
    DRW-24B1ST CD/DVD Burner
    PSU
    PC Power & Cooling 750W Quad EPS12V
    Case
    Cooler Master ATCS 840 Tower
    Cooling
    CM Hyper 212 EVO (push/pull)
    Keyboard
    Ducky DK9008 Shine II Blue LED
    Mouse
    Logitech Optical M-100
    Internet Speed
    300/300
    Browser
    Firefox (latest)
    Antivirus
    Bitdefender Total Security
    Other Info
    Speakers: Klipsch Pro Media 2.1

  • At a glance

    Windows XP Pro 32bit w/SP3AMD Athlon 64 X2 5000+ (OC'd @ 3.2Ghz)TWIN2X2048-6400C4DHX (2 x 1GB, DDR2 800)EVGA 256-P2-N758-TR GeForce 8600GT SSC
    Operating System
    Windows XP Pro 32bit w/SP3
    Computer type
    PC/Desktop
    Manufacturer/Model
    Built by Ghot® (not in use)
    CPU
    AMD Athlon 64 X2 5000+ (OC'd @ 3.2Ghz)
    Motherboard
    ASUS M2N32-SLI Deluxe Wireless Edition
    Memory
    TWIN2X2048-6400C4DHX (2 x 1GB, DDR2 800)
    Graphics card(s)
    EVGA 256-P2-N758-TR GeForce 8600GT SSC
    Sound Card
    Onboard
    Monitor(s) Displays
    ViewSonic G90FB Black 19" Professional (CRT)
    Screen Resolution
    up to 2048 x 1536
    Hard Drives
    WD 36GB 10,000rpm Raptor SATA
    Seagate 80GB 7200rpm SATA
    Lite-On LTR-52246S CD/RW
    Lite-On LH-18A1P CD/DVD Burner
    PSU
    PC Power & Cooling Silencer 750 Quad EPS12V
    Case
    Generic Beige case, 80mm fans
    Cooling
    ZALMAN 9500A 92mm CPU Cooler
    Keyboard
    Logitech Classic Keybooard 200
    Mouse
    Logitech Optical M-BT96a
    Internet Speed
    300/300
    Browser
    Firefox 3.x ??
    Antivirus
    Symantec (Norton)
    Other Info
    Still assembled, still runs. Haven't turned it on for 15 years?
As stated, press the Windows key +X and choose Disk Management, please show screenshot of the lower pane showing all of your drives. You can also use a 3rd party app like Minitool Partition Manager
 

My Computer My Computer

At a glance

Windows 11 Pro Insider 64 bit 25H2 26200.5742Intel Core i7 9700K 3.6016 GBnVidia GEForce RTX 2060 Super
OS
Windows 11 Pro Insider 64 bit 25H2 26200.5742
Computer type
PC/Desktop
Manufacturer/Model
Gigabyte Z390 UD
CPU
Intel Core i7 9700K 3.60
Motherboard
Gigabyte Z390 UD
Memory
16 GB
Graphics Card(s)
nVidia GEForce RTX 2060 Super
Sound Card
onboard
Monitor(s) Displays
Two 27" Dell 4K monitors
Screen Resolution
3840 x 2160
Hard Drives
M.2 NVME SSD, 500 GB; Two 2TB Mechanical HDD's
PSU
850w PSU
Case
Cyberpower PC
Cooling
Water cooled
Keyboard
Backlit Cyberpower gaming keyboard
Mouse
Backlit Cyberpower gaming mouse
Internet Speed
1 GB mbps
Browser
Brave
Antivirus
Windows Security

Attachments

  • diskmanagement1.jpg
    diskmanagement1.jpg
    100.1 KB · Views: 3

My Computer My Computer

At a glance

Windows 11 64bit3.70 gigahertz Intel core i7-8700K16GBNvidia GTX 1050
OS
Windows 11 64bit
Computer type
PC/Desktop
Manufacturer/Model
Bespoke
CPU
3.70 gigahertz Intel core i7-8700K
Motherboard
MSI 7B22
Memory
16GB
Graphics Card(s)
Nvidia GTX 1050
Sound Card
on board
Monitor(s) Displays
Dell 27" Ultrasharp
Screen Resolution
2560 x1440
Hard Drives
Drive c: 1tb SSD
DriveD: 1TB SSD
DriveE: 2tb HDD
External drive Samsung T7 2TBSSD
Cooling
no
Internet Speed
52MB/sec
Browser
Chrome
Antivirus
MalwareBytes & Microsoft Defender
Looks like a humongous system reserved partition to me.
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11AMD Ryzen 7 3800XT32GBEVGA GeForce GTX 1080 Ti
    OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homebuilt
    CPU
    AMD Ryzen 7 3800XT
    Motherboard
    ASUS ROG Crosshair VII Hero (WiFi)
    Memory
    32GB
    Graphics Card(s)
    EVGA GeForce GTX 1080 Ti

  • At a glance

    Windows 11 EducationIntel i7-8550U32GBNvidia Geforce MX150
    Operating System
    Windows 11 Education
    Computer type
    Laptop
    Manufacturer/Model
    Dell Inspiron 7773
    CPU
    Intel i7-8550U
    Memory
    32GB
    Graphics card(s)
    Nvidia Geforce MX150
    Sound Card
    Realtek
    Monitor(s) Displays
    17"
    Screen Resolution
    1920 x 1080
    Hard Drives
    Toshiba 512GB NVMe SSD
    SK Hynix 512GB SATA SSD
    Internet Speed
    Fast!
The Title of Optimize would suggest it is spare space to be used when the drive is checked and bad spots found, something similar to Defrag used with HDDs.
 

My Computers My Computers

System One System Two

  • At a glance

    Win11 Pro RTM Version 24H2 Build 26100.4202Intel Core i5 11th Gen. 2.40GHz12GB
    OS
    Win11 Pro RTM Version 24H2 Build 26100.4202
    Computer type
    Laptop
    Manufacturer/Model
    Dell Vostro 3400
    CPU
    Intel Core i5 11th Gen. 2.40GHz
    Memory
    12GB
    Hard Drives
    256GB SSD NVMe M.2

  • At a glance

    Win11 Pro RTM Version 24H2 Build 26100.4202Intel Core i5 10th Gen. 2.90GHz16GBOnboard, no VGA, using a DisplayPort-to-VGA a...
    Operating System
    Win11 Pro RTM Version 24H2 Build 26100.4202
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Vostro 5890
    CPU
    Intel Core i5 10th Gen. 2.90GHz
    Memory
    16GB
    Graphics card(s)
    Onboard, no VGA, using a DisplayPort-to-VGA adapter
    Monitor(s) Displays
    24" Dell
    Hard Drives
    512GB SSD NVMe, 4TB Seagate HDD
    Browser
    Firefox, Edge
    Antivirus
    Windows Defender/Microsoft Security
The unmounted volume is a partition that is marked as active indicating that at one time it was a partition that the computer booted from in legacy BIOS mode. You can probably just assign it a drive letter and see what was on it.
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11AMD Ryzen 7 3800XT32GBEVGA GeForce GTX 1080 Ti
    OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homebuilt
    CPU
    AMD Ryzen 7 3800XT
    Motherboard
    ASUS ROG Crosshair VII Hero (WiFi)
    Memory
    32GB
    Graphics Card(s)
    EVGA GeForce GTX 1080 Ti

  • At a glance

    Windows 11 EducationIntel i7-8550U32GBNvidia Geforce MX150
    Operating System
    Windows 11 Education
    Computer type
    Laptop
    Manufacturer/Model
    Dell Inspiron 7773
    CPU
    Intel i7-8550U
    Memory
    32GB
    Graphics card(s)
    Nvidia Geforce MX150
    Sound Card
    Realtek
    Monitor(s) Displays
    17"
    Screen Resolution
    1920 x 1080
    Hard Drives
    Toshiba 512GB NVMe SSD
    SK Hynix 512GB SATA SSD
    Internet Speed
    Fast!
As NavyLCDR commented it looks like it was a modified or enlarged MSR.

MiniTool Partition Wizard has a right click option to view files within a partition.

Best Free Partition Manager for Windows | MiniTool Partition Wizard Free

As an all-in-one free partition manager and disk manager software, MiniTool Partition Wizard Free helps manage disk space safely on Windows 11/10/8/7.
www.partitionwizard.com www.partitionwizard.com



Open administrative command prompt and type or copy and paste: (all at one time the commands within the code brackets)

Code: 
reagentc /info
bcdedit /enum all


When these have completed > right click on the the top bar or title bar of the administrative command prompt box > left click on edit then select all > right click on the top bar again > left click on edit then copy > paste into this thread



Open administrative command prompt and type or copy and paste: (all at one time the commands within the code brackets)

Code: 
diskpart
lis dis
lis vol
sel dis 0
det dis
lis par
sel par 1
det par
sel par 2
det par
sel par 3
det par
sel par 4
det par
sel par 5
det par
sel dis 1
det dis
lis par
sel par 1
det par
sel par 2
det par
sel par 3
det par
sel par 4
det par
sel par 5
det par
sel dis 2
det dis
lis par
sel par 1
det par
sel par 2
det par
sel par 3
det par
sel par 4
det par
sel par 5
det par
sel dis 3
det dis
lis par
sel par 1
det par
sel par 2
det par
sel par 3
det par
sel par 4
det par
sel par 5
det par
sel dis 4
det dis
lis par
sel par 1
det par
sel par 2
det par
sel par 3
det par
sel par 4
det par
sel par 5
det par


When these have completed > right click on the the top bar or title bar of the administrative command prompt box > left click on edit then select all > right click on the top bar again > left click on edit then copy > paste into this thread
 
Last edited:

My Computer My Computer

At a glance

Windows 10Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz16 GB Total: Manufacturer : Samsung MemoryTyp...NVIDIA Quadro K3100M; Intel(R) HD Graphics 4600
OS
Windows 10
Computer type
Laptop
Manufacturer/Model
HP
CPU
Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz
Motherboard
Product : 190A Version : KBC Version 94.56
Memory
16 GB Total: Manufacturer : Samsung MemoryType : DDR3 FormFactor : SODIMM Capacity : 8GB Speed : 1600
Graphics Card(s)
NVIDIA Quadro K3100M; Intel(R) HD Graphics 4600
Sound Card
IDT High Definition Audio CODEC; PNP Device ID HDAUDIO\FUNC_01&VEN_111D&DEV_76E0
Hard Drives
Model Hitachi HTS727575A9E364
Antivirus
Microsoft Defender
Other Info
Mobile Workstation
zbook said:
As NavyLCDR commented it looks like it was a MSR.
Click to expand...
Respectfully, it could not have been an MSR. Microsoft Reserved Partitions are only allowed on GPT disks. Since the partition in question is marked as Active, the disk must be MBR. The term system reserved partition is what Microsoft uses to describe an active partition created on an MBR disk solely dedicated to containing the boot files to boot the computer from. MSR is something completely different.
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11AMD Ryzen 7 3800XT32GBEVGA GeForce GTX 1080 Ti
    OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homebuilt
    CPU
    AMD Ryzen 7 3800XT
    Motherboard
    ASUS ROG Crosshair VII Hero (WiFi)
    Memory
    32GB
    Graphics Card(s)
    EVGA GeForce GTX 1080 Ti

  • At a glance

    Windows 11 EducationIntel i7-8550U32GBNvidia Geforce MX150
    Operating System
    Windows 11 Education
    Computer type
    Laptop
    Manufacturer/Model
    Dell Inspiron 7773
    CPU
    Intel i7-8550U
    Memory
    32GB
    Graphics card(s)
    Nvidia Geforce MX150
    Sound Card
    Realtek
    Monitor(s) Displays
    17"
    Screen Resolution
    1920 x 1080
    Hard Drives
    Toshiba 512GB NVMe SSD
    SK Hynix 512GB SATA SSD
    Internet Speed
    Fast!
Agree that the current disk 3 is currently MBR as it has the active partition.

Sorry for the earlier comment.

Consider these:

If it were MBR from the start then it would have had to be a system partition that was enlarged.

If it were GPT that had been converted to MBR then it could have been either System or MSR.
 

My Computer My Computer

At a glance

Windows 10Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz16 GB Total: Manufacturer : Samsung MemoryTyp...NVIDIA Quadro K3100M; Intel(R) HD Graphics 4600
OS
Windows 10
Computer type
Laptop
Manufacturer/Model
HP
CPU
Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz
Motherboard
Product : 190A Version : KBC Version 94.56
Memory
16 GB Total: Manufacturer : Samsung MemoryType : DDR3 FormFactor : SODIMM Capacity : 8GB Speed : 1600
Graphics Card(s)
NVIDIA Quadro K3100M; Intel(R) HD Graphics 4600
Sound Card
IDT High Definition Audio CODEC; PNP Device ID HDAUDIO\FUNC_01&VEN_111D&DEV_76E0
Hard Drives
Model Hitachi HTS727575A9E364
Antivirus
Microsoft Defender
Other Info
Mobile Workstation
Actually, disk management shows that it has no filesystem on it. So it's hard to say what it was at one time.
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11AMD Ryzen 7 3800XT32GBEVGA GeForce GTX 1080 Ti
    OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homebuilt
    CPU
    AMD Ryzen 7 3800XT
    Motherboard
    ASUS ROG Crosshair VII Hero (WiFi)
    Memory
    32GB
    Graphics Card(s)
    EVGA GeForce GTX 1080 Ti

  • At a glance

    Windows 11 EducationIntel i7-8550U32GBNvidia Geforce MX150
    Operating System
    Windows 11 Education
    Computer type
    Laptop
    Manufacturer/Model
    Dell Inspiron 7773
    CPU
    Intel i7-8550U
    Memory
    32GB
    Graphics card(s)
    Nvidia Geforce MX150
    Sound Card
    Realtek
    Monitor(s) Displays
    17"
    Screen Resolution
    1920 x 1080
    Hard Drives
    Toshiba 512GB NVMe SSD
    SK Hynix 512GB SATA SSD
    Internet Speed
    Fast!
You can get more options to work with this drive using a free partitioning software like Minitool Partition Wizard, EaseUs or Aoemi Partition Assistant
 

My Computer My Computer

At a glance

Windows 11 Pro Insider 64 bit 25H2 26200.5742Intel Core i7 9700K 3.6016 GBnVidia GEForce RTX 2060 Super
OS
Windows 11 Pro Insider 64 bit 25H2 26200.5742
Computer type
PC/Desktop
Manufacturer/Model
Gigabyte Z390 UD
CPU
Intel Core i7 9700K 3.60
Motherboard
Gigabyte Z390 UD
Memory
16 GB
Graphics Card(s)
nVidia GEForce RTX 2060 Super
Sound Card
onboard
Monitor(s) Displays
Two 27" Dell 4K monitors
Screen Resolution
3840 x 2160
Hard Drives
M.2 NVME SSD, 500 GB; Two 2TB Mechanical HDD's
PSU
850w PSU
Case
Cyberpower PC
Cooling
Water cooled
Keyboard
Backlit Cyberpower gaming keyboard
Mouse
Backlit Cyberpower gaming mouse
Internet Speed
1 GB mbps
Browser
Brave
Antivirus
Windows Security
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