Want to mount a usb drive read only

[sunnychan]

Hi,
I want to mount a USB drive as read only on a Android 4 tablet via OTG cable. As the drive internal format is a proprietary one, that always caused the file explorer to create unexpected lost.dir directory and all other files truncated as 0 bytes.
Can anyone help?
Thanks

 

[nailzer]

Put the usb drive on you computer, right click on the folders you want to protect, go to properties and set them to read only.

 

[sunnychan]

I have tried but it fail. Will have another try tomorrow. The files are not truncated this time.
Please also suggest other file explorer apps that easy do mounting. I don't want rooting my tablet as most requested to do so.
There are read error.