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Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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| Question | Answer |
| What is Encryption? | > "Scrambling" of data > Applies a special encryption algorithm to the data > Strong algorithms require long mathematical research > Special key is required to decrypt the data > Usually within the OS to encrypt and decrypt files in real time |
| What is Fragmentation? | > Files in secondary storage are not always written in one continuous block (i.e., they may be split up) > Fragmented files - those that are not contiguous - take longer to load |
| What is Defragmentation? | > Software that reorganises the data on the storage device so that all files are stored in adjacent blocks > Defragmented disks increase the performance of the computer |
| How does Fragmentation affect SSDs? | > Fragmented data does not take any longer to load, since SSDs provide random acces > SSDs should not be defragmented, since the reorganisation can shorten its lifetime as it pushes it towards the read/write cycle limit |
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