Premiere scratch disk full. Again.

Why Premiere Pro keeps eating your SSD, and what to do about it

You open Premiere Pro, import a timeline, and there it is: "Scratch disks are full." The project grinds to a halt. You spend twenty minutes deleting cache files, clear enough space to keep working, and two weeks later the same warning appears. This cycle is familiar to almost every Premiere Pro editor, and it persists because the underlying storage model has a structural problem that cache management alone cannot solve.

Premiere Pro generates an enormous amount of temporary data. Media cache files, peak files for audio waveforms, preview renders, conform files, auto-save copies of your project. On a busy project, this temporary data can consume 50 to 100 gigabytes or more. Add in the source footage that Premiere expects to find on a local or directly attached drive, and a 500 GB SSD fills up remarkably quickly.

The standard advice is to clear cache regularly, move your scratch disk to a larger drive, and stay on top of disk housekeeping. That advice works, and this post covers it in detail. But it treats the symptom rather than the cause. The cause is that Premiere Pro was designed for a world where all media lives on local storage, and every project you touch deposits hundreds of gigabytes of source files onto your machine. Cloud-native storage changes that equation in a meaningful way.

What fills up the scratch disk

Premiere Pro writes several categories of temporary files, and understanding them helps you decide what to delete and what to relocate.

Media cache is the largest category for most editors. When you import footage, Premiere creates indexed versions of your media: .pek files for audio waveforms, .cfa files for conformed audio, and .mcdb database files that track the relationships. These files speed up playback and waveform rendering. For a project with dozens of hours of source footage, the media cache can run to tens of gigabytes.

Preview renders are generated when you render sections of your timeline. Each rendered segment is stored as a video file in the preview files directory, and complex timelines with colour correction, effects, and nested sequences can produce many gigabytes of preview files.

Auto-save files accumulate over time. Premiere saves copies of your project file at regular intervals, and the default setting keeps the last 20 versions. For large projects with many sequences, each auto-save can be several megabytes. Over weeks of editing, the auto-save folder grows steadily.

Conform files and audio render files are generated for sequences where audio needs to be converted or conformed to the project sample rate. These are smaller individually but add up across many source clips.

All of these write to locations defined in your scratch disk settings, and by default, many of them write to the same drive as your project file, which is often your boot drive.

How to clear the scratch disk properly

When the warning appears and you need space immediately, here is the practical sequence.

Start with the media cache. Open Premiere Pro, go to Preferences, then Media Cache. Click "Delete" next to "Remove Media Cache Files" and select "Delete unused media cache files." This removes cached files for media that is no longer referenced by any open project. If you need more aggressive clearing, select "Delete all media cache files." Premiere will regenerate cache for any media you use in future sessions, so this is safe but will cause a brief delay the next time you open a project.

Next, clear preview renders from within your project. Go to Sequence, then Delete Render Files. Choose "Delete Render Files for All Sequences" if you want maximum space recovery. You will need to re-render previews later, but this is often the fastest way to reclaim a large block of storage.

Check your auto-save folder manually. Navigate to the Adobe Premiere Pro Auto-Save folder within your project directory. Delete older versions you no longer need, keeping perhaps the five most recent. You can also reduce the number of auto-save versions Premiere retains by adjusting the setting in Preferences under Auto Save.

Finally, look at the project files themselves. Premiere stores "project lock" files and other metadata that can linger after crashes. Search your project directories for .prproj-lock files and delete any that belong to projects you are not currently editing.

Moving the scratch disk to a separate drive

Clearing cache buys time. Relocating the scratch disk buys more.

In Premiere Pro, open Project Settings and select Scratch Disks. You will see settings for Captured Video, Captured Audio, Video Previews, Audio Previews, and Project Auto Save. Each of these can be pointed to a different location. Move them all to a secondary drive, ideally one with ample capacity that is not your boot drive.

If you are using an external SSD, this works well for performance-sensitive scratch data like preview renders. If you have a large spinning drive or NAS, that can work for auto-saves and media cache, though playback performance may suffer for preview files stored on slower media.

You should also relocate the media cache database itself. In Preferences, under Media Cache, change both the media cache files location and the media cache database location to your secondary drive. Restart Premiere after making this change.

This approach helps, and for editors working on one or two projects at a time, it can be sufficient. The limitation emerges when you work across many projects or collaborate with others. Every project still brings its source footage onto local or directly attached storage. Three active projects with 200 GB of source media each, plus their associated cache and preview files, will fill even a 2 TB drive over time.

Why source media is the real storage problem

The scratch disk warning focuses your attention on cache files, but the larger storage consumer is usually the source media itself. A single day of shooting in 4K ProRes generates roughly 100 to 200 GB. A multi-day shoot with multiple cameras can produce a terabyte or more. Premiere Pro expects this footage to sit on a drive that it can access directly.

When you move between projects, old source footage lingers. When you collaborate, each editor maintains their own copy. When you upgrade machines, you migrate terabytes of media alongside your projects. The scratch disk problem is a symptom of a broader storage architecture where every piece of media must be physically present on or near your workstation.

This is where the distinction between managing cache and managing source media becomes important. Cache can be deleted and regenerated. Source media cannot be deleted without risk. So it accumulates.

A different storage model: streaming media from the cloud

Fabric's cloud drive (https://fabric.so/features/your-cloud) takes a different approach to where source media lives. Rather than copying footage to local storage, Fabric streams media from the cloud on demand. Your files exist in Fabric's cloud workspace, and when Premiere Pro needs to read a source clip, the data streams to the application without writing a permanent copy to your local drive.

This means your SSD holds only what it needs to hold: the Premiere project file, cache, preview renders, and whatever is actively being read. The hundreds of gigabytes of source footage that normally sit on your boot drive or external SSD remain in the cloud, accessible but not consuming local space.

For editors who work across multiple projects, this changes the storage arithmetic considerably. Five active projects no longer mean a terabyte of source footage on local drives. The scratch disk fills up more slowly because the single largest category of local storage, source media, is no longer local.

Organising media before it reaches the timeline

The scratch disk problem is often compounded by disorganised media. When footage is scattered across folders, drives, and project structures, editors import more than they need, and Premiere caches all of it. Tighter media organisation reduces the volume of cache Premiere generates in the first place.

Fabric's semantic search (https://fabric.so/features/search) helps here by making footage findable by its content rather than its filename or folder location. Instead of importing an entire shoot folder to find the three clips you need, you can search for the content you remember, locate the relevant clips, and bring only those into your timeline. Less imported media means less cache, fewer peak files, and a scratch disk that stays manageable longer.

Smart organisation features (https://fabric.so/features/smart-organization) complement this by providing structure without manual folder maintenance. Media is tagged and categorised based on its content, so the organisational work that editors typically do after ingest, sorting footage into bins by scene, camera, or content type, happens more fluidly.

Keeping projects portable without carrying the weight

One reason editors end up with so much local media is portability. You want to work from a laptop on location, from a desktop in the studio, and perhaps from a second machine at home. Each environment needs access to the same footage, so you either carry an external drive everywhere or maintain synchronised copies across machines.

Fabric's cloud workspace (https://fabric.so/features/your-cloud) makes the media available from any machine with an internet connection. Your project files reference media in the cloud, and whichever workstation you sit down at can stream the footage it needs. There is no synchronisation step, no drive to pack, no risk that one machine has a newer version of the footage than another.

This also addresses a secondary cause of scratch disk bloat: orphaned media from old projects. When source footage lives in a shared cloud library, you do not need to keep local copies "just in case." The footage remains accessible in Fabric, and your local drive holds only the active working set.

Annotations and review without extra renders

An often overlooked contributor to scratch disk usage is the export cycle during review. Editors export drafts, upload them for feedback, receive notes, and import reference files. Each export consumes disk space, and review cycles can generate multiple large files per round.

Fabric's annotation tools (https://fabric.so/features/annotations) allow timestamped feedback directly on video and audio assets, and drawing annotations on images. This reduces the need for separate review exports, because the review happens on the source material within the shared workspace. Fewer exports means less scratch disk pressure and a shorter feedback loop.

When you need to share a polished cut with a client or stakeholder, Fabric's publish feature (https://fabric.so/features/publish) creates shareable pages with link analytics, without requiring you to export and upload a separate file. The published page references the media in Fabric's cloud, keeping your local drive out of the process entirely.

Practical scratch disk maintenance schedule

Even with cloud-native storage, Premiere Pro will generate cache and preview files that need periodic attention. A reasonable maintenance cadence for most editors: clear unused media cache every two to four weeks, delete render files at the end of each project, audit your auto-save folder monthly, and verify your scratch disk locations after every Premiere update, as updates occasionally reset preferences to defaults.

Set a calendar reminder. The editors who never see the scratch disk warning are the ones who treat cache management as routine maintenance rather than emergency response.

A note on what this does not solve

Fabric does not provide offline support. If you need to edit without an internet connection, you will still need source media on a local drive for those sessions. The cloud-native approach works best for editors who have reliable connectivity in their primary working environments.

Premiere Pro's scratch disk architecture also has quirks that no storage solution can fully eliminate. Certain codecs generate more cache than others. Long-GOP formats like H.264 and H.265 require more intensive caching than intraframe formats like ProRes or DNxHR. Choosing production-friendly codecs at the shoot or transcode stage reduces cache volume regardless of where your source media lives.

Frequently asked questions

What does "scratch disk full" mean in Premiere Pro?

The scratch disk is the location where Premiere Pro stores temporary files: media cache, preview renders, audio conform files, and auto-saves. When the drive designated as the scratch disk runs out of space, Premiere cannot write these temporary files and displays the "scratch disks are full" error. The fix involves either freeing space on that drive or redirecting scratch files to a drive with more capacity.

How do I clear the media cache in Premiere Pro?

Go to Preferences (Edit > Preferences on Windows, Premiere Pro > Preferences on Mac), select Media Cache, and click "Delete" next to "Remove Media Cache Files." Choose between deleting unused files only or deleting all cache files. Deleting all cache is safe but means Premiere will regenerate cache files the next time you open projects referencing that media.

Can I move the Premiere Pro scratch disk to an external drive?

Yes. In Project Settings > Scratch Disks, you can redirect each category of scratch file (video previews, audio previews, auto-saves, captured media) to any connected drive. You should also move the media cache location in Preferences > Media Cache. An external SSD is recommended for preview renders, as slower drives may affect playback performance.

How much space does Premiere Pro cache typically use?

It varies by project size and media type, but 20 to 100 GB is common for active projects. Projects with many hours of long-GOP footage (H.264, H.265) tend to generate more cache than those using intraframe codecs (ProRes, DNxHR). Over time, without regular clearing, cache from multiple projects can consume several hundred gigabytes.

Why does my scratch disk fill up so quickly even after clearing it?

Two reasons. First, Premiere regenerates cache every time you open a project and interact with its media, so clearing cache is only a temporary fix if you keep working with the same large projects. Second, the source footage itself, while not technically part of the scratch disk, occupies the same local storage and competes for space. Addressing source media storage is often more effective than repeatedly clearing cache.

Can Fabric replace my local scratch disk for Premiere Pro?

Fabric replaces the need for local source media storage, which is typically the largest consumer of drive space. Premiere Pro still writes its cache and preview renders locally, so you still need some local or attached storage for scratch files. The difference is that your SSD only needs to accommodate cache and renders rather than cache, renders, and hundreds of gigabytes of source footage.

Does streaming media from the cloud affect Premiere Pro playback performance?

Performance depends on your internet connection speed and the resolution and codec of your footage. Fabric's cloud drive (https://fabric.so/features/your-cloud) streams files on demand, and modern connections handle proxy and mid-resolution workflows well. For maximum timeline performance with high-resolution, high-bitrate media, a fast and stable connection is important.

How do I prevent the scratch disk from filling up again?

Establish a regular maintenance schedule: clear unused cache every two to four weeks, delete render files when you finish a project, and audit auto-saves monthly. For a structural solution, consider moving source media to cloud storage like Fabric so that your local drive only holds temporary working files rather than the full weight of every project you touch.

What codecs generate the most Premiere Pro cache?

Long-GOP (Group of Pictures) codecs like H.264 and H.265 generate significantly more cache than intraframe codecs like Apple ProRes or Avid DNxHR. This is because Premiere must decode multiple frames to display any single frame in a long-GOP file, and it caches the decoded frames for smoother playback. If scratch disk space is a persistent concern, transcoding to an intraframe format before editing can help.

Is Fabric a replacement for external hard drives in a video editing workflow?

For source media storage and sharing, yes, in many cases. Fabric's cloud drive lets you access footage from any connected machine without carrying physical drives. For scratch disk and preview render storage, you still need local or attached storage, as Premiere Pro writes those files locally. The combination of cloud-based source media and a local SSD for scratch files gives most editors a comfortable working setup.

Related pages

• Your Cloud

• Search

• Smart Organisation

• Annotations

• Publish

• Connections