Hi.
If you use just one physical drive then no wonders there if you have small slow almost full drive.
Now you just filled it with more demanding long file and voila you got the need for decent array or just meybe two drives striped depenging your format and compression.
Make BM drive test and post the results here and tell what compression do you use and how big the drive is etc. Otherwise it is more guess work like i have a computer and it does not work. Who knows maybe you have C64 running there 😉
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Margus
https://iconstudios.eu