Free space management in Operating Systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe free space management: <br> Free space management keeps track of {{BLANK_1}} on a storage device.

Operating Systems

Free space management keeps track of [1] on a storage device.

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Afree space

Bused space

Cfile names

Dfile permissions

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing free space with used space.

Thinking it tracks file names or permissions.

Free space management is about tracking the free or unused space on a storage device so new files can be stored efficiently.

2fill in blank

medium

Complete the sentence: <br> One common method of free space management is the {{BLANK_1}} method, which uses a list to track free blocks.

Operating Systems

One common method of free space management is the [1] method, which uses a list to track free blocks.

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Aindexed allocation

Blinked list

Ccontiguous allocation

Dbitmap

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing bitmap instead of linked list.

Confusing allocation methods with free space tracking methods.

The linked list method keeps a list of free blocks by linking them together, making it easy to find free space.

3fill in blank

hard

Fix the error in the statement: <br> The bitmap method uses a {{BLANK_1}} to represent each block's status as free or used.

Operating Systems

The bitmap method uses a [1] to represent each block's status as free or used.

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Abit

Bfile descriptor

Clinked list

Dbyte

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing linked list which is a different method.

Choosing byte which is larger than needed.

The bitmap method uses a single bit for each block: 0 means free, 1 means used (or vice versa), making it efficient to track space.

4fill in blank

hard

Fill both blanks to complete the description: <br> In the bitmap method, each {{BLANK_1}} in the bitmap corresponds to a {{BLANK_2}} on the disk.

Operating Systems

In the bitmap method, each [1] in the bitmap corresponds to a [2] on the disk.

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Abit

Bblock

Cfile

Ddirectory

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing file or directory with block.

Thinking bitmap uses bytes instead of bits.

Each bit in the bitmap represents one block on the disk, indicating if it is free or used.

5fill in blank

hard

Fill all three blanks to complete the code snippet for free space management: <br> free_space = {{BLANK_1}}(size) <br> for i in range(size): <br>     if free_space[{{BLANK_2}}] == 0: <br>         allocate_block({{BLANK_3}})

Operating Systems

free_space = [1](size)
for i in range(size):
    if free_space[[2]] == 0:
        allocate_block([3])

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Abitarray

Bi

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using bitarray without importing or defining it.

Using wrong variable names instead of i.

This code creates a list to represent free space, checks each index i, and allocates the block at i if it is free (0).