matthew_eli
Senior Member
3.0.0.4.382.18547 lowered my HDD transfer speeds to 5MB/s from above 30 using USB3.0 and interference on 2.4GHz disabled...
Darn, first time I had issues with this so went back to to 3.0.0.4.380.7743 and all good again...
Is your HDD format on EXT2/3/4? Because it could be the same behaviour that RT-AC86U has with 382 baseline and SMB transfer (it randomly drops the SMB reads from >100Mb/s to 15 Mb/s). FTP is not affected by this problem, so I think it should be related to some I/O or EXT filesystem issues and SMB transfers