You may suspect your old drive if it is making any unnatural clicking noises indicating that it is near it's active life. Otherwise you can backup the data and do a full format for identifying any bad sectors.
Nowadays the mechanical hard disks have become cheaper and faster with very large capacities. For the money you have spent on the old 160, you will get a modern faster high capacity SATA drives. If a SSD is way too much for you now, you can go for a decent normal hard disk and have peace of mind.