GATE PYQ

Computer Organization

Q251.
A fast wide SCSI-II disk drive spins at 7200 RPM, has a sector size of 512 bytes, and holds 160 sectors per track. Estimate the sustained transfer rate of this drive

Q252.
Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stored in a bit serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk are respectively:

Q253.
For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional to the seek distance due to

Q254.
Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stored in a bit serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk are respectively:

Q255.
The total time to prepare a disk drive mechanism for a block of data to be read from it is

Q256.
In case of a DVD, the speed of data transfer is mentioned in multiples of?

Q257.
Formatting for a floppy disk refers to

Q258.
Consider a hard disk with 16 recording surfaces (0-15) having 16384 cylinders (0-16383) and each cylinder contains 64 sectors (0-63). Data storage capacity in each sector is 512 bytes. Data are organized cylinder-wise and the addressing format is (cylinder no., surface no., sector no.). A file of size 42797 KB is stored in the disk and the starting disk location of the file is (1200, 9, 40). What is the cylinder number of the last sector of the file, if it is stored in a contiguous manner?

Q259.
A hard disk system has the following parameters :Number of tracks =500Number of sectors/track =100Number of bytes /sector =500Time taken by the head to move from one track to adjacent track =1 msRotation speed =600 rpm.What is the average time taken for transferring 250 bytes from the disk ?

Q260.
A particular disk unit uses a bit string to record the occupancy or vacancy of its tracks, with 0 denoting vacant and 1 for occupied. A 32-bit segment of this string has hexadecimal value D4FE2003. The percentage of occupied tracks for the corresponding part of the disk, to the nearest percentage is: