| Era | Technology | Driver Complexity | |------|------------|-------------------| | 1980s | MFM / RLL (IDE precursor) | Simple PIO, polling | | 1990s | PATA (IDE), SCSI | Interrupt-driven, DMA, BIOS int 13h | | Early 2000s | SATA, USB 2.0 | AHCI standard, hotplug | | 2010s | NVMe, SDXC, UFS | PCIe queues, MSI-X, parallelism | | 2020s | CXL-attached memory, ZNS SSDs | Zone commands, persistent memory semantics |
Mass storage device drivers serve as the critical abstraction layer between operating system I/O subsystems and physical or virtual storage media. This paper explores the architectural design of storage drivers, contrasting the historical Command Set Architecture (CSA) approach with modern software stacks such as the Advanced Host Controller Interface (AHCI) and Non-Volatile Memory Express (NVMe). It analyzes the transition from interrupt-driven, scalar I/O models to highly parallelized, queue-based models required by Solid State Drives (SSDs). Furthermore, the paper discusses the role of the SCSI architectural model in unifying diverse storage technologies under a common protocol. mass storage device drivers
From PIO (Programmed I/O) to DMA , from single queue to multi-queue , from polling to interrupt + polling hybrid (PCIe MSI-X) . | Era | Technology | Driver Complexity |
Converts OS requests into protocol commands: Furthermore, the paper discusses the role of the