It supports bits, bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), terabytes (TB), and petabytes (PB).
Windows uses binary units (1 KB = 1024 bytes) but labels them as KB. macOS uses decimal units (1 KB = 1000 bytes). This causes apparent size differences for the same file.
1 TB equals 1000 GB in the SI standard, or 1024 GiB in the binary standard used by most operating systems.
A standard definition movie is 700 MB to 1.5 GB. A 1080p Blu-ray rip is 8-15 GB. A 4K HDR movie is 50-100 GB.
Modern smartphones typically come with 64 GB, 128 GB, 256 GB, or 512 GB of internal storage.
Both use the same storage units (GB, TB). SSDs are faster and more durable but more expensive per GB. HDDs are slower but cheaper for large capacities.
At 128 kbps MP3, approximately 250 songs fit in 1 GB. At 320 kbps, approximately 100 songs fit in 1 GB.