Part 4 Flashcards
What is data compression?
“Reducing file size to save storage space or speed up transmission.”
What are benefits of data compression?
“Saves storage, reduces bandwidth usage, and speeds up file transfers.”
How does encryption enhance data security?
“By requiring a decryption key to access the original data.”
Why is utility software needed alongside an OS?
“The OS may not handle specialized tasks like encryption or defragmentation.”
What are housekeeping tasks in computing?
“Routine maintenance (e.g., disk cleanup, backups, updates).”
How does encryption software work?
“It uses algorithms (e.g., AES) to scramble data into ciphertext.”
What is the difference between lossy and lossless compression?
“Lossy permanently removes data; lossless allows exact reconstruction.”
When is data compression typically used?
“For storing large files (e.g., videos) or speeding up network transfers.”
What causes disk fragmentation?
“Files being split into non-contiguous sectors due to repeated writes/deletes.”
How does defragmentation improve disk performance?
“By rearranging files into contiguous blocks, reducing read/write time.”
What is a key reason to use utility software over OS tools?
To perform advanced tasks (e.g., deep encryption) not handled by the OS.
