As it's clear from the title.
Someone told me that torrent programs keep reading and writing to HDD for long time and that will slow down this HDD and may cause damage to it.
Is that true ??
The hard disks (even SDD) have mechanical parts or are subject to wearing. The more you use your hard disk from a user perspective, the more you use the hard disk physical parts. So using a bittorrent client is using your disk. But you don't say your are damaging your car engine because your are driving it, so you don't damage your hard disk either.
The traditional rotational hard disk have different health parameters (that you can monitor via SMART). The main one that you can monitor are:
Those 2 health parameters can increase by just having your computer turned on with no service running! When a disk is close to breakdown, some other parameters should be monitored. Those are mainly related to fault in reading or writing to the disk. Check the SMART article on Wikipedia.
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