A 1TB solid-state drive is a reasonable starting point for many gaming PCs, but the answer depends on how many games you keep installed at once. A few large games, Windows, applications, recordings, and updates can use the space sooner than the drive label suggests. Rather than treating 1TB as a universal target, estimate the size of your active library and decide whether you are comfortable moving or removing games occasionally.
What a 1TB drive actually provides
Drive makers generally use decimal units: 1TB is 1,000,000,000,000 bytes. Windows commonly displays that capacity as about 931GB because it uses a binary calculation while retaining the GB label. The drive has not lost roughly 69GB; the same bytes are being expressed differently. Partitions, Windows, recovery files, applications, and user data then reduce the free space shown in File Explorer. Microsoft's storage-capacity explanation describes the unit difference and the effect of system partitions.
For a buying decision, do not assume the whole advertised terabyte is available for game installs. Look at the actual free-space reading on the computer. A refurbished gaming PC may already contain Windows, drivers, utilities, and a preinstalled game. Two PCs with nominally identical 1TB drives can therefore arrive with different amounts of free space.
Game sizes vary widely
There is no reliable “average game” for storage planning. As examples from their current Steam system-requirement pages, Hades lists 15GB of available space in its minimum Windows requirements, Cyberpunk 2077 lists 70GB and requires an SSD, and Baldur's Gate 3 lists 150GB and also requires an SSD. Those figures are publisher requirements at the time of writing, not promises that every installed copy will occupy exactly that amount. Editions, updates, optional content, and launchers may change the space needed.
The three examples together account for 235GB of listed space before Windows, other applications, any downloadable content, or temporary update space. Five games around 100GB each would use about 500GB. Ten games of that size would not fit on a single 1TB system drive alongside Windows. Conversely, a library mostly made up of smaller games may leave substantial room. Your actual game list is more useful than a generic count.
A simple way to size your active library
List the games you expect to have installed simultaneously, not every title you own. Check each publisher's current storage requirement or its installed size in your launcher. Add the largest five or ten titles, then include room for your non-game files. If you record gameplay, edit video, or keep local media, include those folders separately. Finally, leave uncommitted space for downloads and updates rather than planning to fill the drive completely.
For example, a player with four 70GB games and two 150GB games is planning around 580GB of listed game space. A 1TB SSD may still work, but there is much less room for new titles, capture files, and updates than the nominal capacity implies. A player who keeps two large games installed and rotates the rest may find 1TB comfortable. The right answer changes with the number of games kept locally, not just the number purchased.
Do not use these examples as a fixed minimum free-space rule. Game installers and patches handle temporary files differently, and Windows' reserved storage is intended to help with updates and system processes. Microsoft's Windows storage documentation describes reserved space; the practical step is to check free space before a large download instead of waiting for the drive to be nearly full.
Is 2TB a better starting point?
A 2TB drive is more convenient if you keep a large rotating set of modern games installed, have slow or capped internet, share the PC with other players, or use the computer for video recording as well as gaming. It reduces how often you need to uninstall and redownload titles. It does not make a game run at a higher frame rate merely by being larger. CPU, graphics, memory, and the game's own requirements still determine performance.
A 1TB drive is often the more economical choice when you play a few games at a time, have a reliable connection for redownloading, or can add a second drive later. If choosing between a larger SSD and a better graphics card within a fixed budget, first check whether the current drive can hold your active games. Once it can, the graphics card may be more useful for the games you actually play. Our VRAM guide explains one part of that graphics decision.
Can you add a second SSD later?
Many desktop PCs can accept another drive, but you need to inspect the exact motherboard and case. Check for an available M.2 slot, whether it supports NVMe or SATA, the supported card length, and whether using that slot disables any other ports. A 2.5-inch SATA SSD needs a drive mounting location, a SATA data connection, and a power connector. Some small-form-factor or proprietary prebuilt desktops offer fewer expansion options than a full-size tower.
For a used PC, ask the seller what drive is installed and whether a slot or bay remains free. If you cannot inspect the computer, use the manufacturer service manual for the precise model. A specification sheet for a related model in the same series may not describe the unit being sold. Our older gaming-computer upgrade guide covers the wider compatibility checks that apply before changing components.
If the drive is used, also consider its health, warranty terms, and whether the PC has a current backup. Adding a second drive is generally less disruptive than replacing the Windows boot drive, but it is still sensible to back up important documents and saves before hardware work. Do not assume every save is stored in the same folder as the game installation.
What if your 1TB drive is already full?
Steam lets you create another library location under Settings > Storage and move installed games to it. Its support instructions describe how to select the games and use Move, rather than downloading them again. Other launchers have their own procedures, so check their support pages before moving folders manually. Moving files outside the launcher can make an installation appear missing until the launcher is pointed to the new location.
Uninstalling games you are not currently playing is also reasonable. Check whether their saves are synchronized or backed up first, especially for older or third-party titles. Steam notes that some saves are stored outside the game folder and not all are in Steam Cloud. An external drive can store files or a secondary library, but Steam cautions against installing Steam itself on an external hard drive because of potential performance issues. For a desktop that stays in one place, an internal second SSD is usually a tidier arrangement.
Bottom line
For many players, 1TB is enough for Windows and a focused set of installed games. It becomes restrictive when several large titles, recordings, and other applications must remain on the same drive. Add up your active library, look at actual free space rather than the number on the SSD label, and check whether a second internal drive can be added later. Choose 2TB when avoiding routine storage management is worth the extra cost for your own game library.