apparently newer kernels don't support smartmon on external seagate disk drives
reading this, i was able to solve it with a little work https://www.reddit.com/r/DataHoarder/co ... _ata_pass/
you can get the device id out of lsusb -t after the device is plugged in, then do the echo trick mentioned in the thread.
then I ran eject /dev/sdXXX on the device and replugged it.
now smartmon seems to be working fine!
solved!
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getting smartctl to work on external seagate hard disk
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stevepusser
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Re: getting smartctl to work on external seagate hard disk
We just found out over at MX Linux that Debian's smartmontools wasn't able to update the drive database online, apparently for years and years, but Tim got it working. 
https://forum.mxlinux.org/viewtopic.php?f=115&t=48968
https://forum.mxlinux.org/viewtopic.php?f=115&t=48968
MX Linux packager and developer
Re: getting smartctl to work on external seagate hard disk
Hi stevepusser, Walking tall?
Not sure if you're disagreeing with me, but the problem I'm talking about comes from the linux kernel, which "fixes a seagate bug" by disabling stuff including the smartmon functions, which I was using thru command-line on a headless desktop.
Not sure if you're disagreeing with me, but the problem I'm talking about comes from the linux kernel, which "fixes a seagate bug" by disabling stuff including the smartmon functions, which I was using thru command-line on a headless desktop.