I have a backup external hdd that is over 90% full (160 gigs of space left of 2 tb). It is a Western Digital. I don't know when it was made, but as soon as I bought it, I put folders & data on it. The folders were created in January 2020. So it is at least 5 1/2 years old, and has been used that long. However, this drive is only used as a backup for two computers, and I only back each up, say, 9-10 times a year. So it just hasn't gotten that much usage.
Is this drive equally at risk of failure, as a drive that was being turned on (almost) every day of the year?
Is this drive equally at risk of failure, as a drive that was being turned on (almost) every day of the year?