Windows 8.1 occupied approximately 70GB of your SSD space.
Windows 8.1 occupied approximately 70GB of your SSD space.
The process started without a 256GB requirement, but conversion works differently depending on the operating system versus actual storage. Techquikie has a video explaining this. Windows typically uses around 20-30GB for itself, plus drivers and user data, and it also reserves space for a pagefile. Your 120GB Windows 7 is using about 70GB, with roughly 6GB left for game files and saves.
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you can calculate it by comparing the total storage capacity with what windows interprets. the drive offers 256gb, but windows displays it in a larger format, which uses more bytes per unit. dividing the actual size by the displayed value shows you the real usable space—about 93% of 256gb equals roughly 238gb. this means you should still retain around 203gb. check if any software or backup system is using extra space on the drive.