You install a 1TB drive and Windows hands you about 931GB. The missing-looking space was never lost. SSD makers count one terabyte as one trillion bytes, while Windows presents that same byte count through a binary unit and labels it GB. Your SSD usable capacity shrinks again by a small amount when system partitions and formatting arrive.

Quick Answer

A 1TB SSD showing about 931GB in Windows has the expected decimal-to-binary difference. A 2TB drive shows close to 1.81TB before other partitions take their share. R1,299 was Evetech's July 2026 price for the 1TB Hiksemi T100 Pocket portable SSD; compare advertised capacities using the same convention and plan some free space for updates.

🔢 Two units describe the same bytes

The manufacturer uses decimal units: 1TB equals 1,000,000,000,000 bytes. A binary tebibyte equals 1,099,511,627,776 bytes. Divide the advertised byte count by the binary value and you get about 0.91TiB, which Windows often displays as roughly 931GB.

Every SSD brand faces the same maths. Hard drives and USB storage do too. Evetech's SSD category lists the retail capacity so you can compare products on one scale.

🧱 Partitions take another visible slice

Windows may create EFI, recovery and reserved partitions beside C:. They hold startup and recovery data, so Disk Management shows them even when File Explorer does not assign a drive letter.

A prebuilt PC can add a recovery image. Over-provisioning may reserve flash for drive health and performance. Check Disk Management before assuming a large chunk has vanished.

File-system metadata uses a little space too. The amount changes with the format and volume size, which is why two drives with the same retail capacity may show a small difference after setup.

📦 Buy capacity for the library you keep

A 1TB label will not give you a full 1,000GB volume in Windows, and filling the visible space to the last gigabyte can make updates painful. Add your installed games, capture files and current projects, then leave room for patches plus temporary data.

Check Evetech's best-selling SSD capacities if you are choosing between 1TB and 2TB. The larger model saves you from moving a 150GB game each time another one launches.

Frequently Asked Questions

Why does a 1TB SSD show as 931GB?

The maker counts decimal bytes while Windows displays the amount through a binary conversion under a GB label.

Is the missing space a manufacturing defect?

No. The advertised byte count and the Windows figure describe the same physical capacity with different units.

Does every SSD brand show the same gap?

Yes, drives sold with the same decimal capacity show a similar conversion before partitions.

Does the system partition also take space?

Yes. EFI, recovery and reserved partitions use a small part of the drive.

Can you get the full advertised capacity back?

The full byte count is present. You cannot turn one unit convention into extra flash storage.

Sizing an SSD for a growing game library? Compare 1TB and 2TB options at Evetech using the expected Windows capacity, then leave room for patches and temporary files.