Does it recreate thumbnail files on every start ?
ext4, legacy BIOS, MBR partition type.
EDIT: it looks so according to output of [FONT=courier new]fatrace[/FONT]
Leap 15.5: High disk activity after every start of PCManFM
Archived thread 2493402 from openSUSE and SUSE Linux Enterprise. Markdown source: openSUSE_and_SUSE_Linux_Enterprise/thread_2493402_Leap_15.5_High_disk_activity_after_every_start_of_.md