hardware.usbStorage.manageShutdown
NixOS option
Enable this option to gracefully spin-down external storage during shutdown. If you suspect improper head parking after poweroff, install smartmontools and check for the Power-Off_Retract_Count field for an increment.
type: booleanDefault
declared in: nixos/modules/hardware/usb-storage.nixView source on NixOS/nixpkgs →false