Pen drive gets write protection after using it on a Pi4

Hi all,

i newly setup my Raspberry-NAS, consisting of a PI4, a 3,5" HDD and a 16GB flash drive which I use for data transfer between the Pi4 and my Windows10 PC.

Thats the short history of the 16GB drive:

Formatting on the Pi4 (btrfs) -> writing data on Win10 -> Back to the Pi4, feeding the HDD, deleting the data afterwards -> plug into Win10, and it has write protection.

The protection mustve occured in the Pi4, since the supposedly deleted data shows up again on Win10. I also cant unmount it.

Formatting it again on the Pi4 allows me to repeat the entire process. But I cant format the drive after every data transfer.

What can I do? How do I remove the protection? Is the format the wrong choise? I'd appreciate any advice.

I "unmount" it before pulling it out of the pi, and then I use it on Win10 where its blocked, i cant eject it once i notice the write protection, it wont let me.

There is a wifi-repeater inbetween, that makes it very slow, especially since i have a lot of small data to transfer. It happens to be faster using a portable flash drive. But im currently testing setups and scenarios and collecting values to compare them.

Zitat von macom

I mean during this step. When it is finished do you eject/unmount the pen drive in Win10?

Oh ok, im not 100% sure.

Zitat von macom

Did you try ntfs?

OMV wont let me, only offers me the formats BTRFS, EXT3, EXT4, F2FS, JFS, XFS. Or am I missing something?

Well, I didnt know that. Thanks!