21) A ____________ occurs when two different records calculate to the same hash

Question

21) A ____________ occurs when two different records calculate to the same hash number (logical record number).

a) crash

b) impact

c) conflict

d) collision

Section 17.3 Logical File Access Methods

22) Fragmentation of a disk occurs when

a) files are deleted.

b) files are moved.

c) files grow too large for their anticipated storage and must be moved.

d) All of the above

Section 17.4 Physical File Storage

23) The use of noncontiguous space requires that the file system maintain a detailed, ordered list of assigned blocks for each file in the system. One method of maintaining the lists of blocks allocated to each file is to use the block numbers stored as a linked list, using pointers from one block to the next. This method is known as a(n)

a) joined blocking.

b) linked allocation.

c) connected blocking.

d) associated allocation.

Section 17.4 Physical File Storage

24) One method of maintaining a free space list is to provide a table with one bit for each block on the disk. The bit for a particular block is set to 1 if the block is in use and to 0 if the block is free. This table is called the

a) Bitmap Table.

b) File Map Table.

c) Status Map Table.

d) File Allocation Table.

Section 17.4 Physical File Storage

25) The Universal Data Format (UDF) supports High Definition and Blu-Ray DVD formats. UDF directory format is ______________, consistent with other file directory systems.

a) flat

b) ad hoc

c) matrix

d) hierarchical

Section 17.4 Physical File Storage

26) Many systems provide a means for dividing physical devices, particularly disks, into independent sections called

a) disks.

b) RAIDs.

c) partitions.

d) Storage Pools.

Explanation / Answer

21) d) collision

22) d) All of the above

23) b) linked allocation

The block numbers for a file may be stored as a linked list, using pointers from one block to the next. This method is known as a linked allocation

24) a) Bitmap table

The bitmap method is an economical way of keeping track of free space, since only one bit is needed for each block on the disk. It has the further advantage that it is easy for the file manager to locate contiguous blocks or blocks that are nearby to those already allocated to a file. This allows the file manager to maintain files in a way that can minimize disk seeks during file access.

25) d) hierarchical

26) c) partitions

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