disk controller, disk drive, hard disk drive, hard disk这几个terms是什么样的关系？
The disk controller (or "hard disk controller") is the circuit which allows the CPU to communicate with a hard disk, floppy disk or other kind of disk drive.
disk controller使得CPU和disk drive能够通信。
disk drive 包括有hard disk drive、floppy disk drive等
A hard disk drive (HDD) is commonly referred to as a hard drive, hard disk, or fixed disk drive
现在，disk controller都集成到disk drive里面了。
顺便说一下host adapter
The correct term for the components that allows a computer to talk to a peripheral bus is host adapter or host bus adapter (HBA). On the other hand, a disk controller allows a disk to talk to the same bus
In fact signals read by a disk read-and-write head are converted by a disk controller, then transmitted over the peripheral bus, then converted again by the host adapter into the suitable format for the motherboard's bus, and then read by the CPU.
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