File Management

Question 1

File management separates :

Answer 1

Design and implementation

Question 2

What is a file ?

Answer 2

A file is a named collection of related information that is recorded on a secondary storage

Question 3

What are the attributes of a file ?

Answer 3

Name 
Identifier
Location
Size
Protection mode ( giving permissions) 
Times creation Access modification

Question 4

What are the file operations

Answer 4

Create
Read
Update
Delete

Question 5

How are files organized

Answer 5

Usually into directories with similar attributes and operations

Question 6

Explain Mounting

Answer 6

When a file system on a storage device is mounted at a point in the existing file system

Question 7

Features of the Linux file system

Answer 7

An everything is a file approach

Tree like structure

Question 8

What does everything is a file mean :

Answer 8

Regular files : sequence of bytes
Directories: name/inode association lists
Special files: peripheral device
Links: locations of other files
Pipes:buffers between processes
Symbolic links: names of other files

Question 9

What is the magnetic disk made of ?

Answer 9

spinning platters over which hovers a head attached to a movable arm

Question 10

How is a platter organized

Answer 10

A platter is divided into circular tracks

Question 11

what is a platters track divided into?

Answer 11

sectors

Question 12

What is a magnetic disks cylindermade up of?

Answer 12

The tracks at one arm position

Question 13

How does a magnetic disk read/write?

Answer 13

by moving the arm to the required cylinder and using a head to sense/change the
magnetism of a sector

Question 14

what is a solid state disk made of ?

Answer 14

controller(Microprocessor) buffer memory (Conventional Memory)
flash memory(Easily Deteled)

Question 15

Example of a typical solid state disks

Answer 15

ARM controller,
256Kb buffer 
128Mb flash
4Kb pages
256Kb block size.

Question 16

How is an SSD read ?

Answer 16

copying a flash memory page into the buffer

reading data from the page in the buffer

Question 17

What actions may write on a solid disc?

Answer 17

copying a memory block into the buffer
erasing the block in the flash memory
modifying the block in the buffer
writing the block from the buffer to the flash memory

Question 18

What can increase the lifetime of an SSD?

Answer 18

dynamic wear-levelling

static wear-levelling

Question 19

What does dynamic wearleveling do?

Answer 19

writes new data to the least-recently-used block so cold data is not moved

Question 20

What does static wear-levelling do?

Answer 20

it additionally periodically moves existing data to the least-recently-used block (cold data is moved)