Part III of the OSTEP Book is all about persistent storage. None of these readings are "required", but some of these chapters may be helpful to you in designing and implementing your file system for PS4 (and the others are interesting also).
Dialogue on Persistence
File System Implementation
Crash Consistency: FSCK and Journaling
Log-structured File Systems
Data Integrity and Protection
Making a File
Requirements for Modern File Systems
It's for people who have Mac OS, who have any data, and who really like their data. Whether on a single-drive laptop or on a massive server, it'll store your petabytes with ragingly redundant RAID reliability, and it'll keep the bit-rotted bleeps and bloops out of your iTunes library.
When one block changes, how many hashes need to be updated?
David Patterson, Garth Gibson, and Randy Katz. A Case of Redundant Arrays of Inexpensive Disks (RAID) (SIGMOD 1988)
With RAID 3, if Disk 2 fails, how can it be recovered?
Adaptive Replacement Cache
What should cause the recently used cache size to increase?
What should cause the recently used cache size to shrink?
Modern Storage Systems
Fujio Masuoka, Masaki Momodomi, Yoshihisa Iwata, and Riichiro Shirota. New Ultra High Density EPROM and Flash EEPROM with NAND Structure Cell. IEEE Electron Devices Meeting, 1987.
What does it mean for storage to be solid state?
What does it mean for storage to be non-volatile?
How should file systems be re-designed to account for SSDs and networked storage?
Log-Structured File Systems
Mendel Rosenblum and John K. Ousterhout, The Design and Implementation of a Log-Structured File System. 13
What are the advantages of doing all writes sequentially on the disk?
How is garbage collection different for a LSFS compared to in-memory garbage collection?
Flash Memory File Systems
Why is a Log-Structured File System more appropriate for flash memory than a traditional Unix-style file system?
Bunny Huang, On Hacking MicroSD Cards, December 2013.
For more interesting hardware hacks, see Karsten Nohl's talk on SIM Card Hacking from last year's course, and his public talk: