Transcription of Hard Disk Drives
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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?
HARD DISK DRIVES 3 Head Arm 0 11 10 9 8 7 6 5 4 3 2 1 Spindle Rotates this way Figure 37.2: A Single Track Plus A Head 37.3 A Simple Disk Drive Let’s understand how disks work by building up a model one track at
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