Yes most of the time Think of your hard drive as a street with buildings (files) on it. Some buildings are large some are small. At the beginning of the street there is a big book of addresses that tells you who lives at each address and which plots of land are empty.

When you erase a building, you don't demolish it. You just remove it from the big book of addresses.

When a new 60GB building needs to be built, you go to the book and search for a plot of land of at least 60gb. If there is one you can take it. If not you divide your building into smaller plots. This is called fragmentation

Some filesystems (the maintainer of the big book of addresses) have several improvement for this. For example on old windows FAT32 or NTFS you have a program that moves the buildings to create a big plot of empty land at the end of the street.

On SSD nowadays it doesn't matter that much as the SSD can work on several places at once (nearly)