read completed.  Realized I coded to incorrect spec for write
need to address that once delete is done.
TODO:
delete, fix write
Implement remaining HddDriver isr cases in this order:
delete, write, read
complete iProj 4
known issues:
write needs to take input from the command line
nosfs.makeDirBlock doesn't handle file names too long
nosfs.makeFileBlock doesn't handle files that span blocks
defective functions in nosfs: get(Used/Free)(File/Fat)Blocks
(this means that the info given by ls, and the mbr data tracking fs statistics are going to be wrong)