How to check the available memory space?

Question

With the following command you can check the available memory space:

MMEMory:CATalog:LONG?

The first value in the response is the total memory space and the second value is the free space.

Here an example for a connected USB stick:

MMEMory:CDIRectory 'D:\'

MMEMory:CATalog:LONG?

=> 7145805950,6237925376,"BlueKeep,DIR,0",...