hard to check 12 hours later. :-)
copied 188 gig of 278 gig. Drive is a Samsung V-NAND 860 EVO. It is in an open e-SATA enclosure. Eventlog showed hundreds of these:
An error was detected on device \Device\Harddisk1\DR1 during a paging operation.
According to system properties paging is not set for the HDD or SDD drives. Also got 2 of these errors which are tied to the 433 errors. It refers to the HDD source drive which is 1/3 full.
The system failed to flush data to the transaction log. Corruption may occur in VolumeId: Y:, DeviceName: \Device\HarddiskVolume4.
Failure status: A device which does not exist was specified.
Device GUID: {bb5ade65-ae68-2866-1f00-59f40ad94591}
Device manufacturer:
Device model: Hitachi HDS723030ALA640
Device revision: MKAOA580
Device serial number: MK0311YHG6XH8A
Bus type: SATA
Adapter serial number: