External HDD 3.0 falls to 2.0

Nassim Sonic · Wednesday at 8:27 AM

Hello, when i plug external HDD 3.0 it falls to 2.0

giftwrapped · Wednesday at 8:46 AM

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).

Nassim Sonic · Wednesday at 8:50 AM

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

giftwrapped · Wednesday at 9:05 AM

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

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)

Nassim Sonic · Wednesday at 9:15 AM

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)

Its the same case for all ports even rear and i even tried with my friend hdd and hes cable

Anibor_11 · Wednesday at 10:12 AM

giftwrapped said:
. When I switced to a USB 3.x cable I got 10 Gbit/s = 1250 MB/s (theoretical).

You got the theoretical speed? So it´s not theoretical anymore?

giftwrapped · Wednesday at 10:53 AM

Anibor_11 said:
You got the theoretical speed? So it´s not theoretical anymore?

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)

Nassim Sonic · Wednesday at 11:07 AM

I dont know how to fix it

glasskuter · Wednesday at 4:35 PM

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

External HDD 3.0 falls to 2.0

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