Can't mount USB on the pynq linux

Using pynq Z1, working on data storage with USB drive through USB host. Trying to mount USB to the “usbstorage” directory under the pynq linux. I want to add a function with python to store data into the usb drive.
Fail to mount the device.

You need a space after mount.


I try again but shows " mount point does not exist."
Thank you in advance.

Forgot to update, I have solved this problem by using a 32G SD card mount into USB drive insread after I make the dirctory. If seems that if the size of the usb drive (128G) is too large, the linux can’t mount sucessfully.

To set up the auto mount when power up, I use nano /etc/fstab to get the UUID of USB drive and edit it.

Thank you!