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Hardware basics
Access to data in memory is much faster than access to data on disk.
Disk seeks: No data is transferred from disk while the disk head is being positioned.
Therefore: Transferring one large chunk of data from disk to memory is faster than transferring many small chunks.
Disk I/O is block-based: Reading and writing of entire blocks (as opposed to smaller chunks).
Block sizes: 8KB to 256 KB.
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