1.
2.
3.
4.
12-25. A fixed disk system that uses frequency
modulation to encode data would store the
byte 10100001 as which of the following
codes (P=pulse, N=no pulse)?
PPPPNPNPNPPPPPNP
PPPNPPPNPNPNPNPP
NPPPNPPPPPPPPPNP
NPNPNPNPNPNPNPNP
12-26. Which of the following data encoding
12-27.
12-28.
methods groups bits together and uses a table
to determine what code is written on the
disk?
1.
2.
3.
4.
Non-return-to-zero
Frequency modulation
Modified frequency modulation
Run length limited
A fixed disk system using modified
frequency modulation will encode a logic
ZERO that is preceded by a logic ONE in
which of the following ways?
1. No pulse followed by a pulse
2. A pulse followed by no pulse
3. Two no-pulse periods
4. Two pulses
Which of the following encoding methods
will increase by 50 percent the data density
and transfer rate of a fixed disk system?
1.
2.
3.
4.
Run length limited
Non-return-to-zero
Frequency modulation
Modified frequency modulation
12-29. The encoding method used to write data on a
fixed disk is determined by which of the
following means?
1.
2.
3.
4.
The application software installed in the
computer
The disk operating system (DOS) installed
in the computer
The disk controller
The manufacturer of the disk drive
12-30. The run length limited encoding method can
be used with any fixed disk drive.
1. True
2. False
12-31. A fixed disk’s interleave factor is the
relationship between what two items?
1.
2.
3.
4.
The physical sectors and the logical
sectors of a track
The disk drive and the disk controller
The disk drive and the encoding method
used to store data
The disk drive and the computer
12-32. Interleaving a fixed disk has which of the
following effects?
1.
2.
3.
4.
Increases data density on the disk
Decreases data density on the disk
Increases data retrieval and transfer time
Decreases data retrieval and transfer time
12-33, On a fixed disk with nine sectors per track
and an interleave factor of 4:1, which of the
following would be the physical sector
numbering?
1.
1,9,7,5,3,2,8,6,4
2.
1,8,6,4,2,9,7,5,3
3.
1,2,3,4,5,6,7,8,9
4.
1,4,8,3,7,2,6,5,9
101
