Week 8

Question 1

File system

Answer 1

Abstract layer above secondary storage that allows users to interact with the file system.

Question 2

File Attributes

Answer 2

Name, Identifier, Type

Question 3

Os enforced vs program enforced vs none

Answer 3

OS enforces program to declare in a specific manner, up to program to know what kind of file it is, None is up to OS to figure it out.

Question 4

Directories

Answer 4

Organization of the partitions. Directories will map to physical files.

Question 5

Single level directories

Answer 5

Organization difficult with small disks, no concept of user

Question 6

Two level directories

Answer 6

Top level directory, second level is user files and one directory for system commands.

Question 7

Tree structure

Answer 7

Unix. Long path names that you have to go down the tree to find.

Question 8

Acyclic files

Answer 8

Shared subdirectories and files. Meaning there’s more than one path/name to a given file. Files can be shared, directories cant

Question 9

Solid state disks

Answer 9

Persisten/flash memory. Faster and more expensive.

Question 10

Spinning disk

Answer 10

Layers of platters stacked. Goes over tracks with magnetism.

Question 11

Legacy MBR

Answer 11

Early windows and unix, 512 block for master boot record and rest is 4 partitions

Question 12

Master Boot Record

Answer 12

Partition table and Boot code stored in the same block. Enough bytes to find OS and load kernel. Cannot run two systems at the same time, will dump core. Partitions have codes.

Question 13

GUID

Answer 13

Protective MBR - Protects from legacy systems. GPT header points to partition table. Partition table - 31 blocks per system. Secondary GPT - backup. EFI Boot files and other information for different systems. PCB