CHAPTER 18

The Data Layer

The previous chapter discusses the physical components of a disk drive for recording/retrieving data bits onto/from the magnetic media. But how should these data bits be placed and organized on the disks? In this chapter, we explore some of the data placement alternatives and evaluate some design trade-offs.

It is intuitively obvious that the bits of a given piece of data should be stored together for best storage efficiency and access performance. The piece of data can be a transaction record, a text file, a spreadsheet, a compressed music file, or some other type of file. The reasons are obvious. First, since every piece of data needs to have some sort of identification, storing a piece of data in a single place instead ...

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