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Hard Disk Drives

37 hard disk DrivesThe last chapter introduced the general concept of an I/O deviceandshowed you how the OS might interact with such a beast. In this chapter,we dive into more detail about one device in particular: thehard diskdrive. These Drives have been the main form of persistent data storageincomputer systems for decades and much of the development of file sys-tem technology (coming soon) is predicated on their behavior. Thus,itis worth understanding the details of a disk s operation before buildingthe file system software that manages it. Many of these details are avail-able in excellent papers by Ruemmler and Wilkes [RW92] and Anderson,Dykes, and Riedel [ADR03].CRUX: HOWTOSTOREANDACCESSDATAONDISKHow do modern hard - disk Drives store data? What is the interface?

drive. These drives have been the main form of persistent data storage in computer systems for decades and much of the development of file sys-tem technology (coming soon) is predicated on their behavior. Thus, it is worth understanding the details of a disk’s operation before building

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