(TCO 7) You\'re designing a system that runs applications requiring fast sequent
ID: 3818856 • Letter: #
Question
(TCO 7) You're designing a system that runs applications requiring fast sequential access to files. It cannot afford to lose information due to a corruption of the file system. Which file allocation method would you choose? (Points : 5)
Contiguous
FAT
Indexed
Linked
(TCO 7) An appropriate application of memory-mapped I/O is to use it for writing data to a __________. (Points : 5)
graphics display
keyboard
SCSI device
serial port
TCO 7) Consider a 20GB disk that has 20 surfaces over 10 platters. Each platter has 256 tracks and the block size for the disk is 16KB. Assume that the size of each track is the same. Compute the size of each cylinder on the disk both in terms of the number of bytes and the number of blocks. Also, compute the size of each track. Identify the TRUE statement below with respect to these computations. (Points : 5)
Each track has 4MB
Each track has 512 blocks
Each track has 128 blocks
Each track has 2MB
(TCO 7) Consider a disk that is scheduled using the Shortest Seek First (SSF) policy. At time t, let the disk have the following requests in its queue: Request Cylinder R1 45 R2 39 R3 49 R4 52 R5 69 R6 35 R7 3 R8 66. Assume that the disk head is in cylinder 43 at time t and no other requests arrive until all of the above requests are processed. Determine the schedule of processing for the above set of requests. Based on the processing schedule, identify the TRUE statement among the following, with respect to the relative order of processing the various requests. (Points : 5)
R2 is processed after R6
R8 is processed before R2
R7 is processed before R8
R4 is processed before R2
Explanation / Answer
-> Contiguous allocation file system
-> SCSI device
-> Each track has 4MB
-> R7 is processed before R8
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