The ____ head of a hard disk senses the particles' polarity to retrieve data.

A. read
B. write
C. copy
D. read-write


Answer: D

Computer Science & Information Technology

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Compute the cost of r  A=B s using the following methods:

1. Nested loops 2. Block-nested loops 3. Index-nested loops with a hash index on B in s (consider both clustered and unclustered index) where r occupies 2000 pages, 20 tuples per page; s occupies 5000 pages, 5 tuples per page; and the amount of main memory available for a block-nested loops join is 402 pages. Assume that at most 5 tuples of s match each tuple in r.

Computer Science & Information Technology

The program used to close security holes is called a(n) ________

Fill in the blank(s) with correct word

Computer Science & Information Technology

The reverse of the asymmetric encryption process yields ____.

A. digital signatures B. certificate authorities C. DES D. a Rijndael round

Computer Science & Information Technology

What can be typed in the Windows Search to open the Services Control Panel applet?

A. Regserv.mmc B. Perfmon.msc C. Service.mmc D. Services.msc

Computer Science & Information Technology