Saving on DOSBox

I’m running ZORK.BAT on DOSBox. The problem is that whenever I want to save the game, and it asks me:

insert save disk then enter file name.
(Default is C:SAVEZORK1.DAT):

No matter what I wrote, it would tell me it can’t find the file:

Unable to Access file
Failed.

I tried to copy a file in dos (outside game) and it wouldn’t work as expected. I think maybe the DOSBox doesn’t have writing permissions but I couldn’t figure out how to fix this.

All the files (the ZORK1 folder) are saved in c:OLDGAMES in my pc. I mounted OLDGAMES to be the c drive of the DOSBox so the directory for saving the file in the box is c:ZORK1SAVEZORK1.DAT.
The directory and the file exists both on my computer and in the virtual box (when commanding “dir” it shows the “SAVE” folder in the list).