"Could not apply data set because of a disk error"
I have 436 photographs of the front and back of coins. I am trying to use variables to organise them in matched front and back pairs. Every thing is going well until I get to apply the data sets when I get the message "Could not apply the data set because of a disk error". PSErrorLog.txt is full of records such as "2019:02:04 15:27:14 : e:\ps\ps20\win64_release\20181219.r.30\photoshop\main\interfaces\utrackresouceimp.h : 134 : REQUIRE failed". What is my problem and what can I do to fix it?