Anecdotally, I had my security DVR in my attic, where it'd EASILY hit 130F and up here in FL, and the hard disk couldn't care less recording 24/7 all day in the 50's. Ran up there for 4 years before lightning took out the dvr mobo. The hard disk was still fine. YMMV. If it's under 60, don't stress too much as it's more likely something else is gonna break the drive or cause data loss, or you'll just upgrade for capacity. Just keep good backups.