Please explain in detail, thank you

7) Assume we have a disk that is of size 64 GB. Block size is 16 KB. FAT entry size is 8 bytes. How many entries do we need for that FAT (assume we need an entry for every disk block). Assume disk pointer size is 8 bytes. How many disk blocks are occupied by the FAT? What is the maximum file size? If instead of FAT, two level index allocation would be used to keep track of the data blocks of a file, what would be the maximum size of the file (assuming disk pointer size is 8 bytes)