Problem
Recording to a slow external drive creates I/O contention and indirectly destabilizes the live production system.
Solution
Root Cause / Diagnostic:
Writing high-bitrate master recordings to an external HDD over USB 2.0/3.0 or a fragmented drive creates storage I/O write buffer bottlenecks. When the external storage device write queue fills up, the OBS disk write thread blocks, resulting in memory buffer accumulation. This storage hang propagates back into the video compositing and encoding pipeline, causing system-wide freezes, dropped frames, and eventual software crashes.
Actionable Fix:
1. Relocate the OBS Recording Path in Output Settings to an internal NVMe SSD with minimum sequential write speeds of 1,500 MB/s.
2. Set recording format to fragmented MP4 (fMP4) or MKV to prevent entire video file corruption if a drive disconnection or write timeout occurs.
3. Monitor disk queue length and active write response time in Windows Performance Monitor during a 30-minute test recording to ensure write latency stays below 15ms.
Pro Tip:
Never record live broadcasts to spinning mechanical platters; dedicated solid-state drives prevent write-head parking latency and buffer bloat during long productions.
Writing high-bitrate master recordings to an external HDD over USB 2.0/3.0 or a fragmented drive creates storage I/O write buffer bottlenecks. When the external storage device write queue fills up, the OBS disk write thread blocks, resulting in memory buffer accumulation. This storage hang propagates back into the video compositing and encoding pipeline, causing system-wide freezes, dropped frames, and eventual software crashes.
Actionable Fix:
1. Relocate the OBS Recording Path in Output Settings to an internal NVMe SSD with minimum sequential write speeds of 1,500 MB/s.
2. Set recording format to fragmented MP4 (fMP4) or MKV to prevent entire video file corruption if a drive disconnection or write timeout occurs.
3. Monitor disk queue length and active write response time in Windows Performance Monitor during a 30-minute test recording to ensure write latency stays below 15ms.
Pro Tip:
Never record live broadcasts to spinning mechanical platters; dedicated solid-state drives prevent write-head parking latency and buffer bloat during long productions.