[zilexa]

Well you did help me because I never suspected a cable or hardware issue.

I just added my Win laptop (wifi 11g) as smb share and played a 720p mkv on my rpi (connected via lan to wifirouter). Plays fine.

I just mounted the ntfs usb drive using:
UUID=myuuid /media/usb0 ntfs-3g defaults,noatime,nodiratime,async,big_writes 0 0

issue still there.
Is there a way to test if the linux system is having read issues?
I actually suspect an ntfs filesystem error, although Windows already fixed the drive. I cannot format the drive since it contains 450GB of data..