Floppy Disk Drive Question:

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41. What are DD,HD and ED in reference to floppy disks?
42. What is an FDC?
43. What are the functions of an FDC?
44. What are the input/output ports of an FDC?
45. What is the function of the MSR?
46. What is a 3mode floppy drive?
47. Define the use of the digital control port?
48. What are hardware floppy disk emulators?
49. What is the purpose of a spindle motor in a floppy-drive?
50. How are floppy disk densities measured?