If the amount of data on your startup disk exceeds the 85% limit, your Mac will suffer system errors, freeze-ups, and performance loss. It is crucial to keep at least 15% of the startup disk space free to ensure smooth Mac OS performance. Other partitions store applications and user data. Mac’s startup disk is a separate partition on your Mac’s SSD which contains the operating system.
Users running an OS X Yosemite server have reported a similar issue with a standard 256GB SSD configuration. However, this is not a rare case with Apple computers. Some users believe their Mac has suffered a virus attack. The warning message looks menacing, so less experienced Mac users start googling what it could mean and how to fix their device. Users often get puzzled when their Mac says “Your startup disk is almost full” or gets stuck on the white screen during startup. How to Fix Mac OS X “Startup Disk Full” Issue? Sooner or later, users face the need to configure their data to deal with the “Your startup disk is almost full” warning alert. As a result, they may face an issue of the insufficient amount of storage space. Modern affordable MacBooks are mostly equipped with a 256GB onboard SSD. What to do if your Mac has no more space to store important files? Having enough storage on digital devices has become more important than ever before.