USB Stick Problem

martin2002 · 2021-01-02 11:43:45

Hello! I have a big problem with writing on usb sticks. It's FAT32 stick. I want to write on it films for my parents. After I mount it it is protected and I haven't got a permission to write on it. After I do sudo -i it gave me to use cp on it but extremely slow.
After tons of waiting for about 12 GB. I executed umount -l /dev/sdc1 and there were a lot of waiting too and I unplugged it before the unmount. After plugging it in the TV it shows me that everything is fine but on one episode 5 minutes before the end it starts old film which was deleted.
How can I fix this. And how can I write and unmount fast usb sticks. Also I need to know why it doesn't give me to write on them.

tucuxi · 2021-01-02 12:01:30

Refer to https://wiki.archlinux.org/index.php/US … ge_devices for how to mount the USB device so that non-root users have write access.

What is extremely slow - throughput in MB/s? And what did you expect instead?

seth · 2021-01-02 14:43:29

man fsck.fat

There's likely a dirty bit and possibly conflicting FATs.

Also check "dmesg -w" for whether subsequent writing attempts cause IO errors.

progandy · 2021-01-02 14:58:59

seth wrote:

Also check "dmesg -w" for whether subsequent writing attempts cause IO errors.

Some USB thumb drivers also like to fail silently. They report write success, but not everything is written to the flash chips (possibly because they are worn out). A remount will then show the old contents or maybe mostly new with some old mixed in.

Write speeds for USB drivers aren*t amazing either. With the best USB3 drives and transfer of a single large file you can get 200 MB/s. Small files often transfer with only 20 MB/s or less. With USB2 you are lucky if you can get 30-40 MB/s, small files still with maybe 10-20 MB/s.

Last edited by progandy (2021-01-02 15:04:23)

martin2002 · 2021-01-02 15:50:10

The speed is nearly 1 2 MB/s at some moments

Last edited by martin2002 (2021-01-02 15:50:26)

Arch Linux

#1 2021-01-02 11:43:45

USB Stick Problem

#2 2021-01-02 12:01:30

Re: USB Stick Problem

#3 2021-01-02 14:43:29

Re: USB Stick Problem

#4 2021-01-02 14:58:59

Re: USB Stick Problem

#5 2021-01-02 15:50:10

Re: USB Stick Problem

Board footer