I currently have some annoying problem with external HDD. I'm using some old (7yrs) WD salvaged from laptop in portable enclosure. I have external 4A PSU wich power drive and backfeed rpi. Disk is formatted in NTFS, I added some lines fstab to auto mount it. I distabled power saving options. Everything is good but after few days of usage I'm unable to acces files on it (mainly music on MPD service). Dmesg show multiple : Buffer I/O error on device sdaX, logical block X and Buffer I/O error on dev sda, logical block X, async page read X. It is possible that drive itself is failing form old age ?
I don't have full logs at this moment but It show one I/O error msg, they just multiply when I'm trying to acces files.