If you do a default installation of Seq, it will live on the C drive of that server.

Seq is a hungry creature and will use up 90% of the RAM and all the available disk space.

To control Seq's memory usage...

To tell Seq to store its log files elsewhere

1. Uninstall Seq from its current location on C:  (Details for uninstall from Seq website)
2. Use the Seq “backup and restore” functionality to move the data to the intended new location (About backup-restore from Seq website)
3. Reinstall Seq with the new storage path seq service install -storage="PATH/TO/STORAGE"  (Details for reinstall from Seq website)

 Note that Seq has its own log files, though they are probably not growing as fast as the extent files.  Those can also be configured to go to a different drive.  Refer to the “reinstall” link in step 3 for details.