Adobe Media Cache
Temporary cache files generated by Premiere Pro and After Effects. 100% safe to delete and often frees up massive amounts of storage.
Is it safe to delete
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.thumbnails
A hidden Android folder that stores tiny versions of all your photos. Safe to delete, but it will come back.
AppData
The hidden folder where Windows apps store their settings, profiles, and cached data. Deleting it will wipe out your app preferences and saved data.
Browser Cache
The hidden storage area where web browsers save images and scripts from websites to make them load faster next time.
DeliveryOptimization
A folder Windows uses to share Windows Updates with other PCs on your network or the internet. Safe to clean via Disk Cleanup.
.DS_Store
A hidden macOS file that stores folder view preferences. Completely safe to delete, though your Mac will just create a new one.
.git
The hidden folder containing the entire version control history of a code repository. Deleting it destroys all past commits and branches.
.ost and .pst files
Microsoft Outlook data files that store all your emails, contacts, and calendar events locally on your hard drive.
pagefile.sys
The Windows virtual memory paging file. Deleting it manually can cause system crashes and out-of-memory errors.
Quarantine Folder
The secure folder where antivirus programs lock away detected malware and viruses so they can't harm your computer.
$RECYCLE.BIN
A hidden system folder on every Windows hard drive that stores the files you have deleted but haven't permanently emptied yet.
SoftwareDistribution
The folder where Windows Update downloads new updates. Safe to clean if updates are failing, but should not be deleted randomly.
Steam shadercache
Pre-compiled graphics shaders for Steam games. Safe to delete, but games may stutter the next time you play them.
System Volume Information
A super-hidden Windows folder that stores System Restore points and disk indexing data. Best left completely alone.
$Windows.~BT
Leftover installation files from a previous Windows upgrade. Safe to delete using the Disk Cleanup tool.
WinSxS (Windows Component Store)
The Windows Component Store can take up massive space, but deleting it manually will permanently break your PC.
Is It Safe to Delete hiberfil.sys?
hiberfil.sys is used by Windows for hibernation and fast startup. Deleting it disables these features but is otherwise safe.
Is It Safe to Delete node_modules?
node_modules contains downloaded dependencies for JavaScript projects. It can always be regenerated with npm install.
Is It Safe to Delete System32?
System32 is the core of Windows. Deleting it will completely break your operating system. Never delete this folder.
Is It Safe to Delete Windows.old?
The Windows.old folder contains your previous Windows installation. It's safe to delete and can free up 10-30 GB of space.