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I had hard drive which was target location for CCTV, connected to linux mini pc running rsync in background to collect footage from few locations.

Well, I noticed that sometimes rsync failed due permission error and drive got unmounted by system, it happen few times but after reboot it was working fine, I decided to copy it to new drive, when I started copying on new - it seems it died. It didn't even had 1 full year of work time, around 7 months only.

Not seen in fdisk, not seen in df.

[  166.630651] usb 1-1.3: new high-speed USB device number 5 using dwc_otg

[  166.764048] usb 1-1.3: New USB device found, idVendor=0bc2, idProduct=ab44

[  166.764067] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[  166.764078] usb 1-1.3: Product: Backup+ Hub

[  166.764088] usb 1-1.3: Manufacturer: Seagate

[  166.764098] usb 1-1.3: SerialNumber: 01CB7506B0MC

[  166.767450] hub 1-1.3:1.0: USB hub found

[  166.768127] hub 1-1.3:1.0: 3 ports detected

[  167.080564] usb 1-1.3.1: new high-speed USB device number 6 using dwc_otg

[  167.212743] usb 1-1.3.1: New USB device found, idVendor=0bc2, idProduct=ab38

[  167.212755] usb 1-1.3.1: New USB device strings: Mfr=2, Product=3, SerialNumber=1

[  167.212762] usb 1-1.3.1: Product: Backup+ Hub BK

[  167.212769] usb 1-1.3.1: Manufacturer: Seagate

[  167.212776] usb 1-1.3.1: SerialNumber: 01CB7506B0MC

[  167.214136] usb-storage 1-1.3.1:1.0: USB Mass Storage device detected

[  167.215125] scsi host0: usb-storage 1-1.3.1:1.0

[  168.251708] scsi 0:0:0:0: Direct-Access     Seagate  Backup+ Hub BK   D781 PQ: 0 ANSI: 6

[  168.255463] sd 0:0:0:0: [sda] Spinning up disk...

[  168.266405] sd 0:0:0:0: Attached scsi generic sg0 type 0

[  168.351029] usb 1-1.3-port2: Cannot enable. Maybe the USB cable is bad?

[  224.411031] ready

[  224.411442] sd 0:0:0:0: [sda] Very big device. Trying to use READ CAPACITY(16).

[  224.411842] sd 0:0:0:0: [sda] 15628053167 512-byte logical blocks: (8.00 TB/7.28 TiB)

[  255.340667] usb 1-1.3.1: reset high-speed USB device number 6 using dwc_otg

[  260.510807] usb 1-1.3.1: device descriptor read/64, error -110

Cable is okay, I tried replacing it. I did even tear plastic cover aparat, I did checked SATA connections, I tried connecting it directly in PC on Windows - disk didn't show up in disk manager interface either. Disk is bit vibrating, but it wasn't the quiet one from beginning. Now when connected, after some time it makes weird short "ding,ding,ding" sound and stops, then again vibrating.

Can someone advise whether data is lost or is there any chance ?
I'm not sure how to interpret the error from dmseg. I never had disk "die" in this way, I'd also appreciate someone explaining what actually might have happened.