I am working on a Dataset of 70gb
Earlier using df -BG
command
I was being shown
Filesystem 1G-blocks Used Available Use
I had the same problem. I am not sure this is a solution since I haven't tested it thoroughly, but it seems like the [Python 2 / No GPU] and [Python 3 / No GPU] runtimes have only 40GB of storage, whereas the [Python 3 / GPU] runtime has 359GB of storage.
Try changing your notebook runtime type to [Python 3 / GPU] by going to "Runtime" > "Change runtime type". Hope it helps!