I used an SSHD (Basically a HHD with a flash-storage for data that is used often), NOT an SSD. NOW I got one SSD to that, so my system and my most important software is installed on the SSD and my data and some other software on the SSHD. The footage is from OBS mostly, but it also happens with footage from Dxtory or Shadowplay. (Because of that, I don’t think a codec is the problem, but anyways: )
The OBS-footage is on mp4 made with x264 encoder.
Dxtory uses Lagarith Lossless Codec
Shadowplay uses H.264
The specs of my drives: (If you need)
(Data/Old SSHD): Seagate Desktop ST2000DX001 SSHD 2TB
(System/New SSD): Samsung 950 Pro 256GB