Blocks may also be referred to as allocation units or clusters.
Each directory entry could list 8 or 16 blocks (depending on disk format) that were allocated to a file.
If a file used more blocks, additional directory entries would be needed.
[2] A detriment of this method is the disk may have free space (unallocated blocks) but data cannot be appended to a file because all directory entries are used.
[2] The Commodore DOS used a similarly named but significantly different noting.