What's the Best Ssd for Video Editing Scratch Disk?

Quick Answer

The best SSD for a video editing scratch disk is a fast NVMe Gen 4 drive with high sustained write speeds and strong thermal management. For most editors, the Samsung 990 Pro, WD Black SN850X, or Seagate FireCuda 530 are the top picks, with the key requirement being a dedicated SSD separate from your OS drive to avoid I/O conflicts during demanding edit sessions.

What a Scratch Disk Actually Does in Video Editing

A scratch disk is the temporary workspace your editing software uses for rendered previews, cache files, and real-time playback buffers. Adobe Premiere Pro, DaVinci Resolve, and Final Cut Pro all lean heavily on scratch disk performance when you're working with 4K, 6K, or RAW footage. A slow scratch disk causes dropped frames in the timeline, sluggish preview rendering, and stalled export queues.

The scratch disk should always be a dedicated drive, separate from both your OS drive and your media drive. This prevents the drive from simultaneously handling OS reads, media reads, and cache writes, which is the single biggest performance bottleneck in most editor workstations.

What to Look for in a Scratch Disk SSD

Sequential write speed: This is the most critical spec. Aim for at least 5,000 MB/s on a Gen 4 NVMe drive for 4K and above workflows. Gen 3 drives top out around 3,500 MB/s, which is adequate for 1080p but limiting for high-bitrate 4K RAW.

Sustained write performance: Some SSDs have fast burst write speeds but slow dramatically once their SLC cache fills. For scratch disk use, sustained throughput after cache exhaustion matters more than peak burst numbers. The Samsung 990 Pro and WD Black SN850X both maintain strong sustained writes beyond the SLC cache threshold.

Thermal management: Intensive scratch disk use generates heat. Drives without adequate cooling can throttle during long export sessions. A heatsink, either built into the drive or provided by your motherboard's M.2 slot cover, is important for sustained workloads.

Capacity: For scratch disk use, 1TB is the practical minimum. Video cache files accumulate quickly, especially with automatic preview rendering enabled. A 2TB scratch disk gives editors comfortable headroom before manual cache clearing is needed.

Top SSD Picks for Video Editing Scratch Disk

Samsung 990 Pro 2TB: The most well-rounded scratch disk SSD available. Consistent sustained performance, excellent thermal management, and competitive pricing in SA around R1,800 to R2,500 for 2TB. The 990 Pro's performance under extended workloads is among the most reliable in its class.

WD Black SN850X 2TB: WD's flagship Gen 4 drive matches the 990 Pro on speed and excels in sustained random write operations, which is particularly relevant for DaVinci Resolve's database-heavy cache structure. SA pricing sits around R2,000 to R2,800 for 2TB.

Seagate FireCuda 530 2TB: Slightly higher peak sequential speeds than the Samsung and WD alternatives, though real-world scratch disk performance differences are marginal. The FireCuda 530 ships with an optional heatsink, which is a useful addition. SA pricing: R2,200 to R2,900.

Samsung 870 EVO 2TB (SATA - Budget Option): For editors on tighter budgets or systems without additional M.2 slots, a SATA SSD scratch disk is significantly faster than an HDD and adequate for 1080p and lightweight 4K workflows. SA pricing around R1,200 for 2TB.

Setting Up Your Scratch Disk in Premiere and Resolve

In Adobe Premiere Pro, go to Edit, Preferences, Scratch Disks, and point all cache locations to your dedicated SSD. In DaVinci Resolve, go to Preferences, then System, and set the Gallery, Cache, and Gallery Stills paths to your scratch SSD. Avoid pointing multiple editors to the same scratch drive simultaneously on a shared workstation.

Frequently Asked Questions

Can I use my OS SSD as a scratch disk?

You can, but it degrades performance significantly. The OS SSD handles constant background reads and writes from Windows, applications, and update processes. Adding scratch disk I/O on top creates contention that slows both OS responsiveness and editing performance. A dedicated scratch SSD is always the better approach.

How often should I clear my scratch disk SSD?

In Premiere Pro and Resolve, clear caches every few weeks or whenever a project wraps. Cache files from older projects take up space without providing any ongoing benefit. Most editing software includes a one-click cache purge option under their Preferences or Project settings.

Does NVMe Gen 5 make sense for a scratch disk?

Gen 5 NVMe drives offer up to 12,000 MB/s sequential reads but carry a significant price premium and generate more heat. For video editing scratch disk use, Gen 4 at 7,000 MB/s is already well ahead of what Premiere Pro or Resolve can fully saturate in typical workflows. Gen 5 makes more sense for professional ingest workflows handling multiple simultaneous 8K RAW streams.