Hard disk space loss
Hard drive manufacturers uses 1 KB = 1000 bytes but computer’s operating systems use 1 KB = 1024 KB (KiB). Same for 1 GB = 1000000000 bytes and 1 GiB = 1073741824 bytes, etc. Here’s table how much you’ll lose disk space because of this mismarketing done by manufacturers. There’s also loss of space because filesystem needs metadata for it’s own use. This space loss is depending which filesystem is used (NTFS, FAT, ZFS, ext4, btrfs, ..).
Hard drive space losses
| Marketed | Bytes in disk | Usable bytes for OS | Usable GiB for OS | Lost bytes | Lost GiB |
| 0,5 GB | 500 000 000 B | 463 129 088 B | 0,4657 GiB | 36 870 912 B | 0,0343 GiB |
| 1,0 GB | 1 000 000 000 B | 926 258 176 B | 0,9313 GiB | 73 741 824 B | 0,0687 GiB |
| 2,0 GB | 2 000 000 000 B | 1 852 516 352 B | 1,8626 GiB | 147 483 648 B | 0,1374 GiB |
| 4,0 GB | 4 000 000 000 B | 3 705 032 704 B | 3,7253 GiB | 294 967 296 B | 0,2747 GiB |
| 8,0 GB | 8 000 000 000 B | 7 410 065 408 B | 7,4506 GiB | 589 934 592 B | 0,5494 GiB |
| 16,0 GB | 16 000 000 000 B | 14 820 130 816 B | 14,9012 GiB | 1 179 869 184 B | 1,0988 GiB |
| 32,0 GB | 32 000 000 000 B | 29 640 261 632 B | 29,8023 GiB | 2 359 738 368 B | 2,1977 GiB |
| 64,0 GB | 64 000 000 000 B | 59 280 523 264 B | 59,6046 GiB | 4 719 476 736 B | 4,3954 GiB |
| 128,0 GB | 128 000 000 000 B | 118 561 046 528 B | 119,2093 GiB | 9 438 953 472 B | 8,7907 GiB |
| 256,0 GB | 256 000 000 000 B | 237 122 093 056 B | 238,4186 GiB | 18 877 906 944 B | 17,5814 GiB |
| 500,0 GB | 500 000 000 000 B | 463 129 088 000 B | 465,6613 GiB | 36 870 912 000 B | 34,3387 GiB |
| 512,0 GB | 512 000 000 000 B | 474 244 186 112 B | 476,8372 GiB | 37 755 813 888 B | 35,1628 GiB |
| 1 000,0 GB | 1 000 000 000 000 B | 926 258 176 000 B | 931,3226 GiB | 73 741 824 000 B | 68,6774 GiB |
| 2 000,0 GB | 2 000 000 000 000 B | 1 852 516 352 000 B | 1 862,6451 GiB | 147 483 648 000 B | 137,3549 GiB |
| 4 000,0 GB | 4 000 000 000 000 B | 3 705 032 704 000 B | 3 725,2903 GiB | 294 967 296 000 B | 274,7097 GiB |
| 6 000,0 GB | 6 000 000 000 000 B | 5 557 549 056 000 B | 5 587,9354 GiB | 442 450 944 000 B | 412,0646 GiB |
| 8 000,0 GB | 8 000 000 000 000 B | 7 410 065 408 000 B | 7 450,5806 GiB | 589 934 592 000 B | 549,4194 GiB |
| 16 000,0 GB | 16 000 000 000 000 B | 14 820 130 816 000 B | 14 901,1612 GiB | 1 179 869 184 000 B | 1 098,8388 GiB |
| 32 000,0 GB | 32 000 000 000 000 B | 29 640 261 632 000 B | 29 802,3224 GiB | 2 359 738 368 000 B | 2 197,6776 GiB |
| 60 000,0 GB | 60 000 000 000 000 B | 55 575 490 560 000 B | 55 879,3545 GiB | 4 424 509 440 000 B | 4 120,6455 GiB |
| 64 000,0 GB | 64 000 000 000 000 B | 59 280 523 264 000 B | 59 604,6448 GiB | 4 719 476 736 000 B | 4 395,3552 GiB |
| 80 000,0 GB | 80 000 000 000 000 B | 74 100 654 080 000 B | 74 505,8060 GiB | 5 899 345 920 000 B | 5 494,1940 GiB |
| 128 000,0 GB | 128 000 000 000 000 B | 118 561 046 528 000 B | 119 209,2896 GiB | 9 438 953 472 000 B | 8 790,7104 GiB |