What would I have to install on arch linux for it to detect usb devices and be displayed on the lxde file manager?

The Arch wiki is your friend.

https://wiki.archlinux.org/index.php...torage_Devices

(It's also a great all-around reference, regardless of your distro.)

Thanks.

I still do have a problem, I can't mount or create a fat32 file system.

When you plug the device in, what does dmesg report about it?

[202857.943082] usb 1-5: new high speed USB device number 11 using ehci_hcd
[202858.179173] scsi12 : usb-storage 1-5:1.0
[202859.921664] scsi 12:0:0:0: Direct-Access PNY USB 2.0 FD 4096 PQ: 0 ANSI: 0 CCS
[202861.298010] sd 12:0:0:0: [sdb] 7831552 512-byte logical blocks: (4.00 GB/3.73 GiB)
[202861.299003] sd 12:0:0:0: [sdb] Write Protect is off
[202861.299007] sd 12:0:0:0: [sdb] Mode Sense: 43 00 00 00
[202861.300156] sd 12:0:0:0: [sdb] No Caching mode page present
[202861.300161] sd 12:0:0:0: [sdb] Assuming drive cache: write through
[202861.958005] sd 12:0:0:0: [sdb] No Caching mode page present
[202861.958011] sd 12:0:0:0: [sdb] Assuming drive cache: write through
[202861.959023] sdb: sdb1
[202861.964129] sd 12:0:0:0: [sdb] No Caching mode page present
[202861.964135] sd 12:0:0:0: [sdb] Assuming drive cache: write through
[202861.964139] sd 12:0:0:0: [sdb] Attached SCSI removable disk
[202876.324040] usb 1-5: USB disconnect, device number 11