Solved Drive Letters for Removable USB drives


IanMosley

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I'm expeiencing changes to removeable USB drive letters between ejecting and next re-inserting at some later date - almost everytime it reverts to next free unused letter, but not necessarily so.

1.webp

Can anyone offer a solution?
 

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Have you tried manually assigning them a unused drive letter?
 

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  • OS
    Windows 11 Pro 25H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    PowerSpec B746
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    Intel Core i7-10700K
    Motherboard
    ASRock Z490 Phantom Gaming 4/ax
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    16GB (8GB PC4-19200 DDR4 SDRAM x2)
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    NVIDIA GeForce GTX 1050 TI
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    #1. LG ULTRAWIDE 34" #2. AOC Q32G2WG3 32"
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    Samsung SSD 860 EVO 1TB
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    PowerSpec/Lian Li ATX 205
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    Windows 11 Canary Channel
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    PowerSpec G156
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    Intel Core i5-8400 CPU @ 2.80GHz
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    AsusTeK Prime B360M-A
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it reverts to next free unused letter

It always does that if its assigned drive letter is already used when it is connected.
But you have not said if that applies to your case.


Denis
 

My Computer

System One

  • OS
    Windows 11 Home x64 Version 25H2 Build 26200.8037
Have you tried manually assigning them a unused drive letter?
Yes - using 'Disk Management'
It always does that if its assigned drive letter is already used when it is connected.
But you have not said if that applies to your case.


Denis
The drive DOES NOT have a drive letter in use when connected
 

My Computer

System One

  • OS
    Windows 11 Pro 25H2 (Build 26200.8524)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Pro Max Tower T2 FCT2250
    CPU
    Intel Core Ultra 9 285 5.6 GHz
    Motherboard
    64-bit operating system, x64-based processor
    Memory
    32.00 GB
    Graphics Card(s)
    Intel Integrated Graphics (128 MB)
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    Realtek Audio
    Monitor(s) Displays
    Dell P2714H Monitor
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    1920 x 1080
    Hard Drives
    1 x 512GB M.2 XG10d SED KIOXIA PCIe solid state drive (Internal)
    1 x 2TB Seagate ST2000DM008-2UB102 HDD (Internal)
    1 x 1TB Seagate STGX4000400 External HDD
    1 x 4TB Seagate STGX4000400 External HDD
    1 x 6TB WD Elements AE 2689 External HDD
    PSU
    500 Watts
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    Microsoft Wired Keyboard 600
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    Microsoft USB Basic Optical Mouse v2.0
    Browser
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    Windows Defender + Malwarebytes Premium
    Other Info
    BaseBoard Manufacturer Dell Inc.
    BaseBoard Product 022RY57
    BaseBoard Version A01

My Computers

System One System Two

  • OS
    Windows 11 Pro 25H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    PowerSpec B746
    CPU
    Intel Core i7-10700K
    Motherboard
    ASRock Z490 Phantom Gaming 4/ax
    Memory
    16GB (8GB PC4-19200 DDR4 SDRAM x2)
    Graphics Card(s)
    NVIDIA GeForce GTX 1050 TI
    Sound Card
    Realtek Audio
    Monitor(s) Displays
    #1. LG ULTRAWIDE 34" #2. AOC Q32G2WG3 32"
    Screen Resolution
    #1. 3440 X 1440 #2. 1920 x 1080
    Hard Drives
    NVMe WDC WDS100T2B0C-00PXH0 1TB
    Samsung SSD 860 EVO 1TB
    PSU
    750 Watts (62.5A)
    Case
    PowerSpec/Lian Li ATX 205
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    Logitech K270
    Mouse
    Logitech M185
    Browser
    Microsoft Edge and Firefox
    Antivirus
    Webroot SecureAnywhere CE 26.1
  • Operating System
    Windows 11 Canary Channel
    Computer type
    PC/Desktop
    Manufacturer/Model
    PowerSpec G156
    CPU
    Intel Core i5-8400 CPU @ 2.80GHz
    Motherboard
    AsusTeK Prime B360M-A
    Memory
    16 MB DDR 4-2666
    Monitor(s) Displays
    23" Speptre HDMI 75Hz
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    1920x1080
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    Samsung 970 EVO 500GB NVMe
    Keyboard
    Logitek K270
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    Logitek M185
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This happens if first time is assigned letter D, for example, but next time you connect it D is taken by a different drive. So File Explorer assigns the next free letter, say E. To always take the same letter make sure no other device uses the letter when you connect it. Also if you manually assign a specific letter, say J, then every time you connect it will be letter J unless some other device uses it.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 23H2 (5699), 25H2 (8457)
    Computer type
    Laptop
    Manufacturer/Model
    Acer Extensa 5630EZ
    CPU
    Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz
    Motherboard
    Acer Extensa 5630
    Memory
    4GB
    Graphics Card(s)
    Mobile Intel(R) GMA 4500M (Mobile 4 series)
    Sound Card
    Realtek ALC268 @ Intel 82801IB ICH9 - High Definition Audio Controller
    Monitor(s) Displays
    1
    Screen Resolution
    1280x800
    Hard Drives
    Samsung SSD 850 EVO 250GB SATA Device (250 GB, SATA-III)
    Internet Speed
    VDSL 50 Mbps
    Browser
    MICROSOFT EDGE
    Antivirus
    WINDOWS DEFENDER
    Other Info
    Legacy MBR installation, no TPM, no Secure Boot, no WDDM 2.0 graphics drivers, no SSE4.2, cannot get more unsupported ;) This is only my test laptop. I had installed Windows 11 here before upgrading my main PC. For my main PC I use everyday see my 2nd system specs.
  • Operating System
    Windows 11 Pro v25H2 (build 26200.8457)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom-built PC
    CPU
    Intel Core-i7 3770 3.40GHz s1155 (3rd generation)
    Motherboard
    Asus P8H61 s1155 ATX
    Memory
    2x Kingston Hyper-X Blu 8GB DDR3-1600
    Graphics card(s)
    GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB (GV-N3050WF2OCV2-6GD)
    Sound Card
    Realtek HD audio (ALC887)
    Monitor(s) Displays
    Sony Bravia KDL-19L4000 19" LCD TV via VGA
    Screen Resolution
    1440x900 32-bit 60Hz
    Hard Drives
    WD Blue SA510 2.5 1000GB SSD as system disk, Western Digital Caviar Purple 4TB SATA III (WD40PURZ) as second
    PSU
    Thermaltake Litepower RGB 550W Full Wired
    Case
    SUPERCASE MIDI-TOWER
    Cooling
    Deepcool Gamma Archer CPU cooler, 1x 8cm fan at the back
    Keyboard
    Mitsumi 101-key PS/2
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    Sunnyline OptiEye PS/2
    Internet Speed
    100Mbps
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    Other Info
    Legacy BIOS (MBR) installation, no TPM, no Secure Boot, WDDM 3.0 graphics drivers, WEI score 7.4
Did you assign a drive letter that is rarely used? Such as a drive letter from M to Z.
The USB in question (should always) be V - see post #01 - and if not I reset it toV
This happens if first time is assigned letter D, for example, but next time you connect it D is taken by a different drive. So File Explorer assigns the next free letter, say E. To always take the same letter make sure no other device uses the letter when you connect it. Also if you manually assign a specific letter, say J, then every time you connect it will be letter J unless some other device uses it.
No other device is assigned letter V.
 

My Computer

System One

  • OS
    Windows 11 Pro 25H2 (Build 26200.8524)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Pro Max Tower T2 FCT2250
    CPU
    Intel Core Ultra 9 285 5.6 GHz
    Motherboard
    64-bit operating system, x64-based processor
    Memory
    32.00 GB
    Graphics Card(s)
    Intel Integrated Graphics (128 MB)
    Sound Card
    Realtek Audio
    Monitor(s) Displays
    Dell P2714H Monitor
    Screen Resolution
    1920 x 1080
    Hard Drives
    1 x 512GB M.2 XG10d SED KIOXIA PCIe solid state drive (Internal)
    1 x 2TB Seagate ST2000DM008-2UB102 HDD (Internal)
    1 x 1TB Seagate STGX4000400 External HDD
    1 x 4TB Seagate STGX4000400 External HDD
    1 x 6TB WD Elements AE 2689 External HDD
    PSU
    500 Watts
    Cooling
    Air
    Keyboard
    Microsoft Wired Keyboard 600
    Mouse
    Microsoft USB Basic Optical Mouse v2.0
    Browser
    Firefox
    Antivirus
    Windows Defender + Malwarebytes Premium
    Other Info
    BaseBoard Manufacturer Dell Inc.
    BaseBoard Product 022RY57
    BaseBoard Version A01
This happens if first time is assigned letter D, for example, but next time you connect it D is taken by a different drive. So File Explorer assigns the next free letter, say E. To always take the same letter make sure no other device uses the letter when you connect it. Also if you manually assign a specific letter, say J, then every time you connect it will be letter J unless some other device uses it.
It's been a very long time since I manually assigned a drive letter to a USB drive but that's exactly how I remember it working. I wonder if this is something that MS has changed in Widows 11.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 25H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    PowerSpec B746
    CPU
    Intel Core i7-10700K
    Motherboard
    ASRock Z490 Phantom Gaming 4/ax
    Memory
    16GB (8GB PC4-19200 DDR4 SDRAM x2)
    Graphics Card(s)
    NVIDIA GeForce GTX 1050 TI
    Sound Card
    Realtek Audio
    Monitor(s) Displays
    #1. LG ULTRAWIDE 34" #2. AOC Q32G2WG3 32"
    Screen Resolution
    #1. 3440 X 1440 #2. 1920 x 1080
    Hard Drives
    NVMe WDC WDS100T2B0C-00PXH0 1TB
    Samsung SSD 860 EVO 1TB
    PSU
    750 Watts (62.5A)
    Case
    PowerSpec/Lian Li ATX 205
    Keyboard
    Logitech K270
    Mouse
    Logitech M185
    Browser
    Microsoft Edge and Firefox
    Antivirus
    Webroot SecureAnywhere CE 26.1
  • Operating System
    Windows 11 Canary Channel
    Computer type
    PC/Desktop
    Manufacturer/Model
    PowerSpec G156
    CPU
    Intel Core i5-8400 CPU @ 2.80GHz
    Motherboard
    AsusTeK Prime B360M-A
    Memory
    16 MB DDR 4-2666
    Monitor(s) Displays
    23" Speptre HDMI 75Hz
    Screen Resolution
    1920x1080
    Hard Drives
    Samsung 970 EVO 500GB NVMe
    Keyboard
    Logitek K270
    Mouse
    Logitek M185
    Browser
    Firefox, Edge and Edge Canary
    Antivirus
    Windows Defender
It's been a very long time since I manually assigned a drive letter to a USB drive but that's exactly how I remember it working. I wonder if this is something that MS has changed in Widows 11.

No, there's no change...USB drives are assigned the drive letter you assigned (unless already in use).

I allow myself to attach up to two "transient" USB drives (D: and E:) at the same time. Thus, for my USB drive that I use for my local backups, I have it assigned as F: and this drive letter assignment strategy has not failed over the years.
 

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Microsoft Surface Laptop Studio
    Memory
    32GB
    Hard Drives
    1TB
No, there's no change...USB drives are assigned the drive letter you assigned (unless already in use).
This is my issue, they do NOT behave in the way- see post #07
 

My Computer

System One

  • OS
    Windows 11 Pro 25H2 (Build 26200.8524)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Pro Max Tower T2 FCT2250
    CPU
    Intel Core Ultra 9 285 5.6 GHz
    Motherboard
    64-bit operating system, x64-based processor
    Memory
    32.00 GB
    Graphics Card(s)
    Intel Integrated Graphics (128 MB)
    Sound Card
    Realtek Audio
    Monitor(s) Displays
    Dell P2714H Monitor
    Screen Resolution
    1920 x 1080
    Hard Drives
    1 x 512GB M.2 XG10d SED KIOXIA PCIe solid state drive (Internal)
    1 x 2TB Seagate ST2000DM008-2UB102 HDD (Internal)
    1 x 1TB Seagate STGX4000400 External HDD
    1 x 4TB Seagate STGX4000400 External HDD
    1 x 6TB WD Elements AE 2689 External HDD
    PSU
    500 Watts
    Cooling
    Air
    Keyboard
    Microsoft Wired Keyboard 600
    Mouse
    Microsoft USB Basic Optical Mouse v2.0
    Browser
    Firefox
    Antivirus
    Windows Defender + Malwarebytes Premium
    Other Info
    BaseBoard Manufacturer Dell Inc.
    BaseBoard Product 022RY57
    BaseBoard Version A01
Change the drive letter to V manually from Disk Manager. Remove the drive and connect it again. It should be letter V. Make sure no other device is letter V, also no network path is mapped to letter V.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 23H2 (5699), 25H2 (8457)
    Computer type
    Laptop
    Manufacturer/Model
    Acer Extensa 5630EZ
    CPU
    Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz
    Motherboard
    Acer Extensa 5630
    Memory
    4GB
    Graphics Card(s)
    Mobile Intel(R) GMA 4500M (Mobile 4 series)
    Sound Card
    Realtek ALC268 @ Intel 82801IB ICH9 - High Definition Audio Controller
    Monitor(s) Displays
    1
    Screen Resolution
    1280x800
    Hard Drives
    Samsung SSD 850 EVO 250GB SATA Device (250 GB, SATA-III)
    Internet Speed
    VDSL 50 Mbps
    Browser
    MICROSOFT EDGE
    Antivirus
    WINDOWS DEFENDER
    Other Info
    Legacy MBR installation, no TPM, no Secure Boot, no WDDM 2.0 graphics drivers, no SSE4.2, cannot get more unsupported ;) This is only my test laptop. I had installed Windows 11 here before upgrading my main PC. For my main PC I use everyday see my 2nd system specs.
  • Operating System
    Windows 11 Pro v25H2 (build 26200.8457)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom-built PC
    CPU
    Intel Core-i7 3770 3.40GHz s1155 (3rd generation)
    Motherboard
    Asus P8H61 s1155 ATX
    Memory
    2x Kingston Hyper-X Blu 8GB DDR3-1600
    Graphics card(s)
    GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB (GV-N3050WF2OCV2-6GD)
    Sound Card
    Realtek HD audio (ALC887)
    Monitor(s) Displays
    Sony Bravia KDL-19L4000 19" LCD TV via VGA
    Screen Resolution
    1440x900 32-bit 60Hz
    Hard Drives
    WD Blue SA510 2.5 1000GB SSD as system disk, Western Digital Caviar Purple 4TB SATA III (WD40PURZ) as second
    PSU
    Thermaltake Litepower RGB 550W Full Wired
    Case
    SUPERCASE MIDI-TOWER
    Cooling
    Deepcool Gamma Archer CPU cooler, 1x 8cm fan at the back
    Keyboard
    Mitsumi 101-key PS/2
    Mouse
    Sunnyline OptiEye PS/2
    Internet Speed
    100Mbps
    Browser
    Microsoft Edge, Mozilla Firefox
    Antivirus
    Microsoft Windows Defender
    Other Info
    Legacy BIOS (MBR) installation, no TPM, no Secure Boot, WDDM 3.0 graphics drivers, WEI score 7.4
Drive letter assignments still work the same as they always have, at least for me. I have two 4TB external SSD drives that only get plugged in once a month, I stuck them down at locations U: and V:. I have backup runs configured for them at those drive locations, and they've never wandered from their assignments from month to month. I never have to tinker with their drive letter assignments from month to month, I just plug them in.
 

My Computers

System One System Two

  • OS
    Win 11 Pro 25H2, Build 26200.8524
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Brew
    CPU
    Intel Core i5 14500
    Motherboard
    Gigabyte B760M G P WIFI
    Memory
    64GB DDR4
    Graphics Card(s)
    GeForce RTX 4060
    Sound Card
    Chipset Realtek
    Monitor(s) Displays
    LG 45" Ultragear, Acer 24" 1080p
    Screen Resolution
    5120x1440, 1920x1080
    Hard Drives
    Crucial P310 2TB 2280 PCIe Gen4 3D NAND NVMe M.2 SSD (O/S)
    Silicon Power 2TB US75 NVMe PCIe Gen4 M.2 2280 SSD (backup)
    Crucial BX500 2TB 3D NAND (2nd backup)
    Seagate 4TB Ironwolf, rotating HDD archive files
    External off-line backup Drives: 2 NVMe 4TB drives in external enclosures
    PSU
    Thermaltake Toughpower GF3 750W
    Case
    LIAN LI LANCOOL 216 E-ATX PC Case
    Cooling
    Lots of fans!
    Keyboard
    Microsoft Comfort Curve 2000
    Mouse
    Logitech G305
    Internet Speed
    Verizon FiOS 1GB
    Browser
    Firefox
    Antivirus
    Malware Bytes & Windows Defender Security
  • Operating System
    Win 11 Pro 25H2, Build 26200.8524
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Brew
    CPU
    Intel Core i5 14400
    Motherboard
    Gigabyte B760M DS3H AX
    Memory
    32GB DDR5
    Graphics card(s)
    Intel 700 Embedded GPU
    Sound Card
    Realtek Embedded
    Monitor(s) Displays
    27" HP 1080p
    Screen Resolution
    1920x1080
    Hard Drives
    Crucial P310 2TB 2280 PCIe Gen4 eD NAND PCIe SSD
    Samsung EVO 990 2TB NVMe Gen4 SSD
    Samsung 2TB SATA SSD
    PSU
    Thermaltake Smart BM3 650W
    Case
    Okinos Micro ATX Case
    Cooling
    Fans
    Keyboard
    Microsoft Comfort Curve 2000
    Mouse
    Logitech G305
    Internet Speed
    Verizon FiOS 1GB
    Browser
    Firefox
    Antivirus
    Malware Bytes & Windows Defender Security
Most of my USB flash drives are assigned letter E, then next available after my SSD and BD-R drive, when used alone. But if I have already plugged one and has taken drive E and then I plug another, it will take letter F. Then this particular drive will always be F unless I manually change the letter to E again.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 23H2 (5699), 25H2 (8457)
    Computer type
    Laptop
    Manufacturer/Model
    Acer Extensa 5630EZ
    CPU
    Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz
    Motherboard
    Acer Extensa 5630
    Memory
    4GB
    Graphics Card(s)
    Mobile Intel(R) GMA 4500M (Mobile 4 series)
    Sound Card
    Realtek ALC268 @ Intel 82801IB ICH9 - High Definition Audio Controller
    Monitor(s) Displays
    1
    Screen Resolution
    1280x800
    Hard Drives
    Samsung SSD 850 EVO 250GB SATA Device (250 GB, SATA-III)
    Internet Speed
    VDSL 50 Mbps
    Browser
    MICROSOFT EDGE
    Antivirus
    WINDOWS DEFENDER
    Other Info
    Legacy MBR installation, no TPM, no Secure Boot, no WDDM 2.0 graphics drivers, no SSE4.2, cannot get more unsupported ;) This is only my test laptop. I had installed Windows 11 here before upgrading my main PC. For my main PC I use everyday see my 2nd system specs.
  • Operating System
    Windows 11 Pro v25H2 (build 26200.8457)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom-built PC
    CPU
    Intel Core-i7 3770 3.40GHz s1155 (3rd generation)
    Motherboard
    Asus P8H61 s1155 ATX
    Memory
    2x Kingston Hyper-X Blu 8GB DDR3-1600
    Graphics card(s)
    GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB (GV-N3050WF2OCV2-6GD)
    Sound Card
    Realtek HD audio (ALC887)
    Monitor(s) Displays
    Sony Bravia KDL-19L4000 19" LCD TV via VGA
    Screen Resolution
    1440x900 32-bit 60Hz
    Hard Drives
    WD Blue SA510 2.5 1000GB SSD as system disk, Western Digital Caviar Purple 4TB SATA III (WD40PURZ) as second
    PSU
    Thermaltake Litepower RGB 550W Full Wired
    Case
    SUPERCASE MIDI-TOWER
    Cooling
    Deepcool Gamma Archer CPU cooler, 1x 8cm fan at the back
    Keyboard
    Mitsumi 101-key PS/2
    Mouse
    Sunnyline OptiEye PS/2
    Internet Speed
    100Mbps
    Browser
    Microsoft Edge, Mozilla Firefox
    Antivirus
    Microsoft Windows Defender
    Other Info
    Legacy BIOS (MBR) installation, no TPM, no Secure Boot, WDDM 3.0 graphics drivers, WEI score 7.4

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