# Disk Space Answers for Mac and Windows > Short, checked answers to the disk space questions people ask most on Mac and Windows: clearing space, System Data, caches, memory cleaners, WinSxS and a full C drive. Canonical: https://bytesweep.app/answers/ Last updated: 2026-11-04 ## Answers to common disk space questions Each answer starts with a direct reply in a few sentences, then the steps, commands and what to watch out for, checked against Apple's and Microsoft's own documentation. - By [Shajeen Ahamed](https://bytesweep.app/about.html#author) - Updated 4 November 2026 ### Mac - [**How do I see folder sizes on a Mac?** Finder hides folder sizes in list view. Turn on Calculate all sizes, use Get Info, or run du in Terminal, and why the three give different numbers.](https://bytesweep.app/answers/see-folder-sizes-on-mac.html) - [**How do I find large files on a Mac?** Find big files on a Mac with Storage settings, a Finder search by size or one Terminal command, and why big folders of small files never show up in a size search.](https://bytesweep.app/answers/find-large-files-on-mac.html) - [**What is safe to delete in the Library folder on a Mac?** Folder by folder: what lives in ~/Library on a Mac, which parts rebuild themselves, which hold your data, and the right way to shrink each one.](https://bytesweep.app/answers/mac-library-folder-what-to-delete.html) - [**How do I clear disk space on a Mac quickly?** A five-minute routine to clear disk space on a Mac with what is built in: the Trash, Downloads, Storage recommendations, old backups and big apps, in the order that pays most.](https://bytesweep.app/answers/free-up-disk-space-on-mac-fast.html) - [**How do I reduce System Data on a Mac?** System Data on your Mac is huge? Seven steps in order, from a restart to Time Machine snapshots, caches and developer files, with the command for each and when to stop.](https://bytesweep.app/answers/reduce-system-data-on-mac.html) - [**How do I clear the cache on a Mac?** Clear the browser cache in Safari, Chrome and Firefox, clear one app's cache safely, and flush the DNS cache on a Mac, with what each one fixes and what it costs you.](https://bytesweep.app/answers/clear-cache-on-mac.html) - [**Is there a Disk Cleanup for Mac?** Macs have no Disk Cleanup, but Storage settings do most of the same jobs. Each Disk Cleanup checkbox and where its Mac equivalent lives, plus what macOS has no tool for.](https://bytesweep.app/answers/disk-cleanup-on-mac.html) - [**Do Mac memory cleaners actually work?** Mac "RAM cleaner" apps free memory for a moment, and macOS fills it again. How to read memory pressure in Activity Monitor, and what actually helps when a Mac runs out of memory.](https://bytesweep.app/answers/do-mac-memory-cleaners-work.html) - [**How do I get more storage on a Mac?** Add storage to a Mac with an external SSD, iCloud or a network drive, which libraries can move off the internal disk safely, and why the internal SSD usually cannot be upgraded.](https://bytesweep.app/answers/get-more-storage-on-mac.html) ### Windows - [**Why is my C drive full, and what can I delete?** What fills the C drive on Windows 10 and 11, where each part lives, which are safe to remove, and the built-in tools and commands that remove them properly.](https://bytesweep.app/answers/why-is-my-c-drive-full.html) - [**Is it safe to delete the WinSxS folder?** Why WinSxS looks huge, how to measure its real size with DISM, and the three supported ways to shrink it on Windows 10 and 11, with what each one costs you.](https://bytesweep.app/answers/is-it-safe-to-delete-winsxs.html) - [**Can I delete hiberfil.sys and pagefile.sys?** What hiberfil.sys, pagefile.sys and swapfile.sys are for, why you cannot simply delete them, and the powercfg and Virtual memory settings that shrink or move them.](https://bytesweep.app/answers/hiberfil-sys-pagefile-sys.html) ### Answered elsewhere on this site - [What is System Data on a Mac, and how to reduce it](https://bytesweep.app/mac-system-data.html) - [What purgeable space is on a Mac](https://bytesweep.app/blog/purgeable-space-mac.html) - [Why Docker takes so much space on a Mac](https://bytesweep.app/docker-disk-space-mac.html) - [What in Xcode is safe to delete](https://bytesweep.app/xcode-storage-cleanup.html) - [Where Ollama stores models, and how to delete them](https://bytesweep.app/blog/ollama-models-disk.html) - [Where LM Studio, Ollama and Hugging Face store models](https://bytesweep.app/ai-model-storage.html) ### See also [Alternatives to WizTree, WinDirStat, TreeSize and DaisyDisk](https://bytesweep.app/alternatives/), the [Bytesweep blog](https://bytesweep.app/blog/index.html) and the [Bytesweep docs](https://bytesweep.app/docs/). ### Bytesweep shows what fills the disk and says what is safe to clear. Free to try for 3 days on Mac, Windows and Linux; $29.99 once per computer to clean. [How it decides what is safe](https://bytesweep.app/how-it-works.html). [Download](https://bytesweep.app/download.html)