External HDD 3.0 falls to 2.0


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Nassim Sonic

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Hello, when i plug external HDD 3.0 it falls to 2.0
 
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Windows 11/25H2

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Both the cable and the port on the PC has to support USB 3.X speed.
I connected my external USB 3.x cabinet to my laptop USB 3.x port yesterday with my mobile phone's USB charging cable. That did not go well, the cable only supported USB 2.0 speed, 480 Mbit/s = 60 MB/s (theoretical). When I switced to a USB 3.x cable I got 10 Gbit/s = 1250 MB/s (theoretical).
 

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The connection is unstable it get fixed sometimes when i move the cable the port support usb 3.0 speed but i get random disconnections or hardely works in 3.0
 

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Nassim Sonic said:
when i move the cable the port support usb 3.0 speed but i get random disconnections or hardely works in 3.0
Click to expand...
Maybe because of a bad/loose USB cable or worn port.
- try a different USB 3.0 cable
- try another USB 3.0 port (rear if desktop)
 

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giftwrapped said:
Maybe because of a bad/loose USB cable or worn port.
- try a different USB 3.0 cable
- try another USB 3.0 port (rear if desktop)
Click to expand...
Its the same case for all ports even rear and i even tried with my friend hdd and hes cable
 

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giftwrapped said:
. When I switced to a USB 3.x cable I got 10 Gbit/s = 1250 MB/s (theoretical).
Click to expand...
You got the theoretical speed? So it´s not theoretical anymore?
 

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Anibor_11 said:
You got the theoretical speed? So it´s not theoretical anymore?
Click to expand...
My apologies—this is the correct information I should have shared initially. :-)
------------------------------------------------------------------------------
CrystalDiskMark 9.0.3 x64 (C) 2007-2026 hiyohiyo
Crystal Dew World: Crystal Dew World
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
SEQ 1MiB (Q= 8, T= 1): 1009.730 MB/s [ 963.0 IOPS] < 8299.31 us>
SEQ 1MiB (Q= 1, T= 1): 858.004 MB/s [ 818.3 IOPS] < 1221.28 us>
RND 4KiB (Q= 32, T= 1): 0.000 MB/s [ 0.0 IOPS] < 0.00 us>
RND 4KiB (Q= 1, T= 1): 0.000 MB/s [ 0.0 IOPS] < 0.00 us>

[Write]
SEQ 1MiB (Q= 8, T= 1): 993.872 MB/s [ 947.8 IOPS] < 8421.89 us>
SEQ 1MiB (Q= 1, T= 1): 854.840 MB/s [ 815.2 IOPS] < 1225.38 us>
RND 4KiB (Q= 32, T= 1): 0.000 MB/s [ 0.0 IOPS] < 0.00 us>
RND 4KiB (Q= 1, T= 1): 0.000 MB/s [ 0.0 IOPS] < 0.00 us>

Profile: Default
Test: 1 GiB (x3) [E: 22% (208/931GiB)]
Mode: [Admin]
Time: Measure 5 sec / Interval 5 sec
Date: 2026/06/09 16:11:42
OS: Windows 11 Pro 25H2 [10.0 Build 26200] (x64)
 

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I dont know how to fix it
 

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A slightly loose cable or a bad cable
A dirty or worn port
A cheap enclosure controller
A damaged connector on the drive
 

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  • System 3 is non compliant Dell 9020 i7-4770/24gb ram Win11 PRO 26200.9168
Does the External HDD have it;s own power supply and what specification do the USB slots have?
 

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You either have not done the Random access tests, chose the wrong tests, or it is a drive with some kind of specialist firmware/formatting.
 

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If the disk is 2.5" (a single USB 3.0 cable for both data and power), then it might be that your USB 3.0 port is not providing enough power. I had a similar issue. After I replaced my USB 3.0 PCIe card for a combo USB 3.0 and SATA III PCIe card, it would not provide enough power and my external hard disks would not be detected properly! I solved that by using a POWERED USB 3.0 hub with is own separate power. In fact they now receive adequate power and they work faster than before!
 

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I wonder if it due to bios updates or maybe because everything in the house is electricity shocking when we touch the metal
 

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With your house electrical problem,having your Will uptodate takes precedence over your computer.
 

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I don't see you answer the question. Is your external HDD powered by the USB cable or does it have its own power adapter? If it is powered by the USB cable then the USB port may not have enough power for the drive. If so, then your only option is to use a powered USB hub.

USB maximum speeds:
USB 2.0 = 480 Mbps (60 MB/s)
USB 3.0 = 5 Gbps (625 MB/s)

Here are speed tests I ran on an external hard drive. The enclosure has its own power adapter.
I ran two tests. One connected to a USB 2.0 port and the other connected to a USB 3.0 port.

USB 2.0:

CrystalDiskMark_20251228175417.webp

USB 3.0

CrystalDiskMark_20251228210725.webp
 

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MisterEd said:
I don't see you answer the question. Is your external HDD powered by the USB cable or does it have its own power adapter? If it is powered by the USB cable then the USB port may not have enough power for the drive. If so, then your only option is to use a powered USB hub.

USB maximum speeds:
USB 2.0 = 480 Mbps (60 MB/s)
USB 3.0 = 5 Gbps (625 MB/s)

Here are speed tests I ran on an external hard drive. The enclosure has its own power adapter.
I ran two tests. One connected to a USB 2.0 port and the other connected to a USB 3.0 port.

USB 2.0:

View attachment 174282

USB 3.0

View attachment 174283
Click to expand...
Its only the hard disk and the cable
 

My Computer My Computer

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OS
Windows 11
Computer type
PC/Desktop
Nassim Sonic said:
Its only the hard disk and the cable
Click to expand...
So my theory is correct. It doesn't receive enough power and speed drops to USB 2.0. Buy a powered USB 3.0 hub. It will make a huge difference in performance.
 

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System One System Two

  • At a glance

    Windows 11 Pro 23H2 (5699), 25H2 (9168)Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz4GBMobile Intel(R) GMA 4500M (Mobile 4 series)
    OS
    Windows 11 Pro 23H2 (5699), 25H2 (9168)
    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
    802.11g wireless 54 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.

  • At a glance

    Windows 11 Pro v25H2 (build 26200.9168)Intel Core-i7 3770 3.40GHz s1155 (3rd generat...2x Kingston Hyper-X Blu 8GB DDR3-1600GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB...
    Operating System
    Windows 11 Pro v25H2 (build 26200.9168)
    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
    Microsoft Compact Optical Mouse
    Internet Speed
    802.11ac 5GHz wireless 260Mpbs
    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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