Question

Which of the following statements is incorrect in relation to example file systems?

a)	with CD-ROM file system files cannot be freed or added after the disk has been manufactured

b)	Joliet extensions were designed to allow UNIX file systems to be copied to CD-ROM

c)	most digital cameras, and MP3 players use the MS-DOS file system

d)the UNIX V7 file system is in the form of a tree starting at the root directory, with the addition of links, forming a directed acyclic graph

With respect to principles of I/O software, what are the ways I/O can be done from the point of view of the operating system? a)programmed I/O, interrupt driven I/O, device independence b) programmed I/O, interrupt driven I/O, synchronous blocking c) interrupt driven I/O, I/O using DMA, uniform interfacing I/O d) programmed I/O, interrupt driven I/O, I/O using DMA Which of the following statements is incorrect with respect to I/O software layers? a)for most I/O interrupts are an unpleasant fact of life and cannot be avoided b) each I/O device attached to a computer needs some device-specific code for controlling it, called the device driver; it is generally written by the operating system manufacturer and comes with the operating system c) if disks, printers, keyboards, and so on, are all interfaced in different ways, every time a new device comes along, the operating system must be modified for the new device – hence a uniform interface is preferable d) a small portion of the I/O software consists of libraries linked together with user programs (and so, it is located in the user-space)

Answer 1

1.Which of the following statements is incorrect in relation to example file systems?

B.Joliet extensions were designed to allow UNIX file systems to be copied to CD-ROM : CD-ROM are designed for Windows.

2. With respect to principles of I/O software, what are the ways I/O can be done from the point of view of the operating system?

d. programmed I/O, interrupt driven I/O, I/O using DMA

Which of the following statements is incorrect with respect to I/O software layers?

c)	if disks, printers, keyboards, and so on, are all interfaced in different ways, every time a new device comes along, the operating system must be modified for the new device – hence a uniform interface is preferable