Since this post probably will get some international visitors, I will write it in english.
I had a client which came with a Seagate 4TB to recover his data. Since was near me, I noticed when he arrived that the harddrive was extremely hot, specially because those drives have an enclosure and no proper ventilation! The harddrive was resetting itself, clicking like crazy, disconnecting constantly and with a large number of reallocated sectors.
In logs you could see the errors like the ones bellow, but the drive could read the files very-slowly even if he was spitting those errors constantly, so I did not even bother to investigate more, I just put the drive near in the datacenter and let it cool slowly to the normal temperature. After that magic: the drive started to work properly. Of course, it’s risky to assume that will work in the future too, but it was working to save the data (was 99% full, and had no backup).
=== START OF INFORMATION SECTION ===
Model Family: Seagate Barracuda 3.5
Device Model: ST4000DM005-2DP166
Serial Number: WGY0H2E4
LU WWN Device Id: 5 000c50 0ac1f455c
Firmware Version: 0001
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5980 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 1.5 Gb/s)
Local Time is: Thu Nov 14 16:13:24 2019 EET
SMART support is: Available – device has SMART capability.