SSD Advertised Size vs. Operating Systems Reported Size
All computer data is stored in bits, using a binary format (that is, ones and zeros). Storage capacity can be measured in different units as shown in this table below with the most common ones:
| Data Measurement | Size |
| Bit | Single Binary Digit (1 or 0) |
| Byte | 8 bits |
| Kilobyte (KB) | 1,024 Bytes |
| Megabyte (MB) | 1,024 Kilobytes |
| Gigabyte (GB) | 1,024 Megabytes |
| Terabyte (TB) | 1,024 Gigabytes |
| Petabyte (PB) | 1,024 Terabytes |
| Exabyte (EB) | 1,024 Petabytes |
Since all computers are based on the binary system, these prefixes represent base 2 amounts. Each level is an increment of 2 to the 10th power, or 1,024.
Hardware storage manufacturers measure 1GB as 1000 MB, while operating systems measure 1GB as 1024 MB. This can cause confusion, as you might think that the drive has less capacity than advertised.
Following are some of the most common sizes already converted. Use an online calculator1 if you need to convert other sizes.
- 40 GB ≈ 37,25 GB
- 60 GB ≈ 55,88 GB
- 80 GB ≈ 74,50 GB
- 120 GB ≈ 111,75 GB
- 160 GB ≈ 149,01 GB
- 200 GB ≈ 186,26 GB
- 240 GB ≈ 223,51 GB
- 320 GB ≈ 298,02 GB
- 400 GB ≈ 372,52 GB
- 500 GB ≈ 465 GB
- 640 GB ≈ 596 GB
- 720 GB ≈ 670,55 GB
- 1 TB ≈ 931,32 GB
- 2 TB ≈ 1.862,64 GB
1Links to third-party sites and references to third-party trademarks are provided for convenience and illustration purposes only. Unless explicitly stated, Intel is not responsible for the contents of such links, and no third-party endorsement of Intel or any of its products is implied.