Re: Slow transfer speed to USB 3.0 portable drive

[Barry <barry@xxxxxxxxxxxxxxxx>]

On 15 Aug 2024, at 21:29, Roger Heflin <rogerheflin@xxxxxxxxx> wrote:

So it is only slow on the slow port?  If so it kind of sounds like the
fs may be mounted sync and/or the disks write cache is disabled.
smartctl --xall <device>  sometimes works against usb disk and
sometimes it does not work.  if it works it will tell you the write
cache status.  The sync and/or btrfs filesystem settings would be seen
in /proc/mounts

Are you using nemo file manager on cinnamon?

Is so its a know issue that has been fixed https://discussion.fedoraproject.org/t/much-slower-usb-transfer-speed-after-updating-from-stock-iso-install/128326/37

Barry

On Thu, Aug 15, 2024 at 3:09 PM Andre Robatino
<robatino@xxxxxxxxxxxxxxxxx> wrote:

The drive is about 76% full but I don't think it's fragmentation since the transfer of the same ~2 GB file to the portable drive is consistently relatively fast from a blue or yellow USB port, and very slow from a black USB port. Here's the output of "df -T /dev/sdb1" with the drive plugged in:

Filesystem     Type  1K-blocks      Used Available Use% Mounted on

/dev/sdb1      btrfs 976759808 735116440 239872328  76% /run/media/andre/Seagate

Below is the output from usbview, this is with it plugged into the desktop's black USB 2.0 port so it's only showing that speed, not the USB 3.0 speed of the portable drive.

Backup+ BK

Manufacturer: Seagate

Serial Number: NA515PK9

Speed: 480Mb/s (high)

Bus:   2

Address:   3

USB Version:  2.10

Device Class: 00

Device Subclass: 00

Device Protocol: 00

Maximum Default Endpoint Size: 64

Number of Configurations: 1

Vendor Id: 0bc2

Product Id: a013

Revision Number: 01.00

Config Number: 1

       Number of Interfaces: 1

       Attributes: 80

       MaxPower Needed: 100mA

       Interface Number: 0

               Name: usb-storage

               Alternate Number: 0

               Class: 08

               Sub Class: 06

               Protocol: 50

               Number of Endpoints: 2

                       Endpoint Address: 02

                       Direction: out

                       Attribute: 2

                       Type: Bulk

                       Max Packet Size: 512

                       Interval: 0ms

                       Endpoint Address: 81

                       Direction: in

                       Attribute: 2

                       Type: Bulk

                       Max Packet Size: 512

                       Interval: 0ms

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