Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsA large System Data bar does not automatically mean your Mac is out of usable disk space. First check the Available figure in Apple menu > System Settings > General > Storage (macOS Ventura 13 and later). On earlier macOS versions, open Apple menu > About This Mac > Storage. Storage information can take time to update after you remove files.
System Data is a broad classification, not a folder you can empty with one click. The safest approach is to review files you control, let macOS manage system files, and avoid deleting unknown items from system or Library folders.
As an Amazon Associate I earn from qualifying purchases.
What is System Data on Mac?
Apple describes System Data (called Other on some older versions of macOS) as a general category for Apple and third-party files that do not fit another storage category. It can include logs, caches, virtual-memory files, temporary files, runtime resources, fonts, app support files and plug-ins. The amount changes with the Mac’s current state, so there is no universal “normal” size.
The Storage pane does not offer a direct command to delete System Data. Apple says macOS manages the category’s contents; use Finder or the apps that created your personal files to manage those instead. Apple’s file-management guide explains that the category’s size varies with the state of the Mac.
#1 Best Overall
- Get NVMe solid state performance with up to 1050MB/s read and 1000MB/s write speeds in a portable, high-capacity drive(1) (Based on internal testing; performance may be lower depending on host device & other factors. 1MB=1,000,000 bytes.)
- Up to 3-meter drop protection and IP65 water and dust resistance mean this tough drive can take a beating(3) (Previously rated for 2-meter drop protection and IP55 rating. Now qualified for the higher, stated specs.)
- Use the handy carabiner loop to secure it to your belt loop or backpack for extra peace of mind.
- Help keep private content private with the included password protection featuring 256‐bit AES hardware encryption.(3)
- Easily manage files and automatically free up space with the SanDisk Memory Zone app.(5). Non-Operating Temperature -20°C to 85°C
Does a large System Data category mean you need to clean your Mac?
Not necessarily. Look at the overall available storage and whether you are seeing a specific problem, such as being unable to download an update or save a file. “Available” storage can include both free space and purgeable items such as caches; Apple notes that some space can be counted as both used and available. A large category by itself is not proof that the disk is critically full.
On Ventura 13 or later, check Apple menu > System Settings > General > Storage. On earlier versions, use Apple menu > About This Mac > Storage. Allow the Storage view to recalculate after cleanup rather than expecting the bar to change immediately. Apple’s overview is Free up storage space on Mac.
Rank #2
- MADE FOR THE MAKERS: Create; Explore; Store; The T7 Portable SSD delivers fast speeds and durable features to back up any endeavor; Build your video editing empire, file your photographs or back up your blogs all in an instant
- SHARE IDEAS IN A FLASH: Don’t waste a second waiting and spend more time doing; The T7 is embedded with PCIe NVMe technology that brings fast read and write speeds up to 1,050/1,000 MB/s¹, making it almost twice as fast as the T5
- ALWAYS MAKE THE SAVE: Compact design with massive capacity; With capacities up to 4TB, save exactly what you need to your drive – from large working files to game data and everything in between
- ADAPTS TO EVERY NEED: Whether using a PC or mobile phone, count on the T7 for extensive compatibility²; It’s a true team player when it comes to heavy-duty application usage or file-saving
- HI RESOLUTION VIDEO RECORDING: Record Ultra High Resolution (4K 60fs) videos directly onto the T7 Portable SSD with your favorite camera or mobile devices; Supports iPhone 15 Pro Res 4K at 60fps video and more³
How do I reduce System Data on my Mac safely?
Rather than trying to delete the category directly, start with personal files and app data you recognize. Apple’s Storage screen may show recommendations and categories such as Documents; use these to locate large files, then decide whether you still need them.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11- Review Downloads and large documents. In Finder, inspect Downloads and the Documents area for installers, archives, videos, or other large files you recognize. Delete only what you no longer need, or move files you want to keep to another storage device.
- Remove unneeded media or apps. Look for locally stored videos, music, or apps you no longer use. Removing an app may not remove documents or other data associated with it, so review those separately when relevant.
- Check old iPhone or iPad backups. If you no longer need a local device backup, remove it through the relevant device-management controls rather than deleting unfamiliar files by hand.
- Review Mail and Bin/Trash. Clear junk or deleted messages if you do not need them, and inspect the Bin or Trash before emptying it. Items there continue to occupy space until removed.
- Wait for Storage to refresh. Return to the Storage view after cleanup and give macOS time to update its figures.
Apple also lists using another storage device for files you want to keep as a way to free internal storage. That moves your files off the Mac’s internal disk; it does not directly remove system-managed data.
Rank #3
- Capacity Display Variance: 500GB external ssd often appears as around 465GB on Windows. MacOS can show full 500 GB capacity. This is binary calculation difference and doesn’t affect SSD hard drive actual physical storage
- 1050 MB/s Speed: Instantly access to your files with blazing-fast 10Gbps external SSD read up to 1050MB/s and write up to 1000MB/s. LED Light indicates USB SSD instant activity
- Data Security: Solid state drives S.M.A.R.T. health diagnostics and adaptive TRIM optimizing data block management ensures consistent write speeds and extends the longevity of the portable SSD
- USB-C & USB-A Cable: Both cables featuring rapid USB 3.2 Gen2, this USB SSD effortlessly bridges devices, enabling seamless cross-platform file transfers and backup between computers, smartphones, tablets and iPhone
- Always Fast: No slowdowns for large file transfers. With SLC caching (25% of current available capacity allocated as high-speed cache), this external SSD delivers steady 10Gbps for transfers within the cache capacity
Can Optimize Storage or iCloud help?
macOS storage recommendations can help make selected files available on demand instead of keeping every item locally. With iCloud, this depends on the files, settings, internet access and the storage available in your iCloud plan. It can free internal space when eligible files are stored in the cloud, but it is not a guaranteed way to shrink System Data. Apple explains the options in Optimise storage space on your Mac.
Should I delete Time Machine local snapshots?
Usually, no. macOS normally removes Time Machine local snapshots as they age or when space is needed, and counts their space as available storage. Apple says a Mac typically creates one snapshot about every hour, keeps snapshots for 24 hours, and retains the last successful backup snapshot until space is needed. On macOS High Sierra or later, a snapshot is also made before a macOS update. These are Apple’s described operating intervals, not a promise that every Mac will show the same snapshot count.
Rank #4
- NEARLY 2X FASTER THAN OUR PREVIOUS GENERATION(8) – move 1,000 high-res photos in under 60 seconds(6) with up to 2000MB/s transfer speeds(2).
- IP65 RATING AND UP TO 3M DROP PROTECTION(3) – protects against spills and drops.
- POCKET-SIZED – fits easily in pockets and small bags.
- SPACE TO OWN YOUR AI CONTENT – speed and capacity to download your high-res clips and photo edits.
- 256-BIT AES ENCRYPTION(4) – helps keep private files secure with password protection.
If you have a specific reason to remove snapshots manually, follow Apple’s instructions for your macOS version in About Time Machine local snapshots. Apple’s method temporarily changes the automatic-backup setting; turn automatic backups back on afterward. Avoid making snapshot deletion the first response to a large System Data figure.
Will Safe Mode clear System Data?
Starting in Safe Mode can clear certain caches, which may provide temporary breathing room for a short-term task such as installing an update. macOS recreates caches as needed, so this is not a lasting cleanup method or a reliable way to reduce System Data by a specific amount. Use Apple’s instructions for starting Safe Mode on your Mac model and macOS version; the exact steps differ between Apple silicon and Intel Macs.
Best Value
- Easily store and access 2TB to content on the go with the Seagate Portable Drive, a USB external hard drive
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
What should I avoid deleting?
- Do not remove arbitrary files from
/System,/Library, hidden cache folders, or app containers just because their names are unfamiliar. - Do not run destructive Terminal commands found online without understanding exactly which files they affect.
- Do not assume a cleanup utility is required: the Storage category is managed by macOS, and user files can be reviewed with built-in tools.
Deleting system or app-support files can break macOS or an app, and may not produce a lasting reduction because some files are recreated.
When should you contact Apple Support?
If the Mac still reports critically low available storage or behaves abnormally after you review user-managed files and allow Storage to update, consult Apple Support guidance for your macOS version or contact Apple Support. A precise diagnosis depends on the Mac’s configuration and the files actually occupying space; do not try to solve an unexplained shortage by deleting unknown system files.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Free tools Windows power users keep installed
One-click scans. No signup required.
