How to Choose Scratch Storage for Photo and Video Projects
I’ll clarify what scratch storage actually needs for photo and video work, from capacity and sustained write speed to SSD endurance, project placement, and backup strategy, so you can choose a sensible drive without paying for performance your workflow won’t use.
Scratch storage is easy to misunderstand because it sounds like a single, specific type of drive. In practice, it’s a role: a fast working location that photo and video applications use for previews, caches, temporary renders, proxies, and other files created during editing. The best choice depends less on a “scratch drive” label than on how your projects are organized and how heavily your applications write to disk.
For many creative hobbyists and freelancers, the sensible answer is a solid-state drive with enough free space, predictable sustained performance, and a backup plan for anything that isn’t truly disposable. The fastest drive available isn’t automatically the best choice, especially if your media files, project libraries, and scratch data all compete for the same limited capacity.
Start by separating scratch data from project data
Scratch files are usually replaceable. If an application loses its cache, you can often rebuild previews, render files, or optimized media from the original footage and project information. That makes scratch storage different from your photo catalog, video project files, original camera files, and finished exports. Those are valuable data and need protection even when they happen to live on the same physical drive.
The distinction matters when you decide how much storage to buy. A drive that is large enough for application caches may be unsuitable as the only home for a video project. Conversely, placing a current project and its scratch files on separate drives can improve consistency because the application isn’t constantly reading source media while writing temporary files to the same device.
You don’t always need a separate physical scratch drive. A single fast internal SSD can work well when it has plenty of free capacity and your projects are modest. A second SSD becomes more useful when you edit high-resolution video, work with several projects at once, keep large photo catalogs, or regularly move media between a camera, external storage, and backup destinations.
Capacity is about headroom, not just the cache size
Applications may let you set a cache limit, but that limit isn’t the only storage your workflow consumes. Video projects can generate large preview files, proxies, audio waveforms, and rendered sections. Photo applications may create previews, thumbnails, local adjustment data, and databases. Temporary exports and downloaded source files can also occupy space without being part of the formal scratch setting.
A nearly full SSD is a poor scratch location. Performance can become less consistent as the drive has less room to manage incoming data, and you’ll have less flexibility when a project suddenly needs additional previews or temporary renders. The exact amount of free space you should preserve varies by drive, application, and workload, so avoid treating a single percentage as a universal rule. Instead, monitor the drive while performing your largest normal task and leave enough room that the operating system and applications never approach an emergency state.
Think in terms of working sets. Estimate the source media for your active projects, the expected cache and proxy files, and the temporary space needed for exports. If you regularly keep several projects open, size for the combined workload rather than the smallest project you edit. Capacity is often a better upgrade than a more expensive speed tier once the drive you own is already fast enough for your media.
Choose SSD performance for the workload you actually have
For scratch storage, sequential performance gets most of the attention because video files and many render operations involve large, continuous transfers. But real editing workloads also include smaller reads and writes: loading project databases, updating metadata, generating thumbnails, and jumping between files. A responsive SSD helps with these mixed operations, while headline sequential speeds describe only part of the experience.
SATA SSDs can still be useful for scratch work, especially for photo applications, proxies, exports, and older systems. NVMe SSDs connected through an appropriate PCIe interface generally offer more bandwidth and lower latency, which is more valuable when your workflow moves large amounts of data or handles multiple streams. However, an NVMe drive doesn’t guarantee that every application will feel dramatically faster. If your source media is on a slower external disk, your processor is rendering, or your project uses relatively small files, the benefit may be modest.
The important distinction is between short burst speed and sustained performance. A drive can write very quickly for a brief period by using a fast cache, then slow substantially when that cache fills. Large video imports, long exports, and repeated render operations can expose that behavior. Look for independent testing that measures sustained writes and thermal behavior, not just the manufacturer’s peak transfer figure.
Match the drive to your connections
Before buying, verify your computer’s available M.2 slots, PCIe generation, thermal clearance, and operating-system support. For an external drive, check the actual USB or Thunderbolt connection on both the computer and enclosure; a fast SSD can't exceed the slower link.
Consider endurance when writes are frequent
Endurance describes how much data a drive is designed to handle over its service life. A scratch drive can write more heavily than a general-purpose storage drive because applications may repeatedly rebuild caches, generate previews, and rewrite temporary media. That doesn’t mean every creator needs an enterprise SSD, but it does mean you should consider workload and warranty terms rather than choosing solely by capacity or peak speed.
Drive endurance ratings are useful for comparison, not a precise prediction of when a device will fail. Your actual write volume depends on whether you store proxies locally, how often you clear and rebuild caches, how large your source files are, and whether the drive also holds a frequently updated project library. A freelancer working with several terabytes of footage each month should pay more attention to sustained workload and endurance than someone editing occasional phone videos.
Consumer TLC-based SSDs are often a sensible middle ground for creative work. Some lower-cost drives use QLC flash, which can provide good capacity and value but may have lower write endurance or less consistent sustained performance depending on the model. That doesn’t make QLC automatically unsuitable for scratch storage. It makes independent testing, the intended workload, and the price difference worth examining.
Also account for cooling. High-performance NVMe drives can reduce speed when they become hot, particularly in a compact case or an unventilated external enclosure. A heatsink or better airflow may help, but it should be compatible with your motherboard, enclosure, and drive warranty requirements. Sustained performance is a system decision, not just a specification on the box.
Decide where the active project should live
There are three common arrangements. You can keep the project and scratch files on one fast internal SSD, place them on separate internal drives, or put one or both on external storage. Each approach can work; the trade-off is between simplicity, performance, capacity, portability, and failure isolation.
One internal SSD is the simplest arrangement. It avoids cable and enclosure issues and is often sufficient for photography and lighter video work. Its weakness is contention: the drive may read original media, update the project database, write cache files, and handle operating-system activity simultaneously. A larger, fast SSD with generous free space can reduce the practical impact, but it doesn’t eliminate competing workloads.
Two internal SSDs can make the workflow more predictable. You might place the operating system and applications on one drive, then keep active projects and scratch data on another. Alternatively, keep source media on one drive and scratch or cache data on another. Which separation helps most depends on the application and whether your workload is read-heavy, write-heavy, or both. Don’t assume that dividing files across two slow drives is better than using one fast drive.
External storage is attractive when you move between computers or need a large working area. It can work well for source media and project archives, particularly over a fast, reliable connection. For scratch use, confirm that the enclosure has adequate cooling and that the cable and port support the expected speed. A loose connection, bus-powered limitation, or accidental unplug can interrupt an edit and potentially corrupt an in-progress project.
Network storage can be convenient for shared media and centralized access, but it adds network speed, latency, configuration, and failure-recovery considerations. It’s usually better treated as shared project or archive storage than assumed to be an ideal high-speed scratch disk. Test the complete workflow before moving critical caches there.
Keep backups separate from scratch storage
Scratch data may be reproducible, but your original photos, footage, project files, and finished work aren't. A scratch SSD should never be considered a backup merely because it is separate from your computer’s main drive. If it fails, is lost, or is accidentally erased, anything stored only on it is gone.
Use a backup approach that covers the files you would be unwilling to recreate. Keep at least one additional copy of active project data, and make sure one backup is disconnected or otherwise protected from accidental deletion and common device failures. For particularly important freelance work, an additional copy in a different physical location can reduce the consequences of theft, fire, or other local damage.
You can usually exclude disposable cache folders from backups, but be deliberate. Project databases, catalogs, adjustment files, custom presets, motion graphics assets, fonts where licensing permits, and the original media may not be reproducible. Before excluding a folder, confirm what the application stores there and whether it contains only rebuildable files.
A sensible buying process
Begin with your largest normal project, not an idealized benchmark. Note the size of your source media, whether you use proxies or optimized media, how much cache your applications generate, and how long large transfers continue. If your current drive slows during those operations, check free space and temperature before assuming you need a premium replacement.
Then choose capacity with headroom, favoring a model with credible sustained-write testing and a suitable endurance rating. For an internal drive, confirm physical fit and motherboard compatibility. For an external drive, budget for the enclosure as part of the storage system rather than treating it as an afterthought. A well-cooled, appropriately connected midrange SSD is often more useful than a faster drive throttling inside an unsuitable enclosure.
Finally, configure the application so scratch locations are easy to identify and clean. Keep irreplaceable project data outside folders you routinely delete, and test that caches can be rebuilt before relying on that assumption. If you’re unsure whether a file is disposable, include it in your backup until you understand the application’s storage model.
The best scratch drive is the one that gives your workflow enough space to breathe, maintains useful performance during long writes, and doesn’t become the only copy of important work. For light photo editing, a suitably sized SATA or NVMe SSD may be plenty. For demanding video projects, prioritize capacity, sustained behavior, cooling, and a dependable project-storage plan over a single impressive speed number.