I'll try to do the synch in the right way for now..
Whe i try to enter prune=4000 in core i have this message : Method not found (code -32601)
I've checked the debug.log, nothing about prune enabled.
In the db.log i have this though :
"wallet.dat: unable to flush: No such file or directory
txn_checkpoint: failed to flush the buffer cache: No such file or directory
wallet.dat: No such file or directory"
Not sure if this got responded to yet but you can't run the prune in core you'd have to git it as an argument as core starts up or add it to the conf file.
And I think you've meesed up typing the drive in, i'd check you've copied it correctly (and for example use quotation marks around it if it's got spaces in it).