my usb is not mounted for the user

Hi,
my usb pen is partitionned on 3 ,
it is automatically mounted,
but the vfat partitions ( see below disk-1 and 2 ) are mounted for me
( bela), but the l can't write as bela in the linux partition
(usbdisk) ?

how to transform it ?

drwxr-xr-x 4 1000 root 1024 Aug 18 12:43 usbdisk
drwx------ 8 bela bela  512 Jan  1  1970 usbdisk-1
drwx------ 2 bela bela  512 Jan  1  1970 usbdisk-2

thanks for help
bela

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