刚刚发现一个未知错误，因为我用 . 检查了我的实际日志journalctl -f。
当我卸载备份 USB 磁盘，unmount /path/to/disk然后拔出电缆时，USB 磁盘内部会发出短暂的噪音（就像长按电源按钮硬关闭电脑一样）。已经不是第一次了
我检查了日志并发现以下几行：
Aug 04 11:20:12 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] Synchronize Cache(10) failed: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
Aug 04 11:20:12 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] Synchronizing SCSI cache
Aug 04 11:20:12 flo-mika-gulfi kernel: usb 4-1: USB disconnect, device number 3
(...)
Aug 04 11:18:38 flo-mika-gulfi systemd[1]: home-flo-backup\x2dusb.mount: Deactivated successfully.
Aug 04 11:17:50 flo-mika-gulfi kernel: EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null). Quota mode: none.
Aug 04 11:17:37 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] Attached SCSI disk
Aug 04 11:17:37 flo-mika-gulfi kernel: sda: sda1
Aug 04 11:17:37 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] Optimal transfer size 33553920 bytes not a multiple of physical block size (4096 bytes)
Aug 04 11:17:37 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Aug 04 11:17:37 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] Mode Sense: 53 00 00 08
Aug 04 11:17:37 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] Write Protect is off
Aug 04 11:17:37 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] 4096-byte physical blocks
Aug 04 11:17:37 flo-mika-gulfi kernel: sd 2:0:0:0: [sda] 625142448 512-byte logical blocks: (320 GB/298 GiB)
Aug 04 11:17:34 flo-mika-gulfi mtp-probe[8391]: bus: 4, device: 3 was not an MTP device
Aug 04 11:17:34 flo-mika-gulfi mtp-probe[8391]: checking bus 4, device 3: "/sys/devices/pci0000:00/0000:00:14.0/usb4/4-1"
Aug 04 11:17:34 flo-mika-gulfi mtp-probe[8390]: bus: 4, device: 3 was not an MTP device
Aug 04 11:17:34 flo-mika-gulfi mtp-probe[8390]: checking bus 4, device 3: "/sys/devices/pci0000:00/0000:00:14.0/usb4/4-1"
Aug 04 11:17:34 flo-mika-gulfi kernel: scsi 2:0:0:0: Direct-Access KESU USB 3.0 0209 PQ: 0 ANSI: 6
Aug 04 11:17:34 flo-mika-gulfi kernel: scsi host2: uas
Aug 04 11:17:34 flo-mika-gulfi kernel: usb 4-1: SerialNumber: DD564198838A2
Aug 04 11:17:34 flo-mika-gulfi kernel: usb 4-1: Manufacturer: KESU
Aug 04 11:17:34 flo-mika-gulfi kernel: usb 4-1: Product: USB 3.0
Aug 04 11:17:34 flo-mika-gulfi kernel: usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Aug 04 11:17:34 flo-mika-gulfi kernel: usb 4-1: New USB device found, idVendor=152d, idProduct=0583, bcdDevice= 2.09
Aug 04 11:17:34 flo-mika-gulfi kernel: usb 4-1: new SuperSpeed USB device number 3 using xhci_hcd
有谁知道，这是关于什么的？快速尝试在网上搜索，但找不到合适的解决方案；只是这对我的 USB 驱动器来说可能是一个坏兆头。
该/etc/fstab条目看起来像这样：
UUID=10235a64-232a-4834-ccdd-bccf8f8fe3d6 /path/to/disk ext4 defaults,noauto,noatime,user 0 0
我已经尝试过了同步选项，但没有改变任何东西。
我很高兴知道，因为 USB 驱动器用于我的日常 Cron 作业，用于使用不同的快照备份我的主目录。这个 USB 驱动器只有几年的历史，很少使用，直到上个月它成为我的备份磁盘。
干杯，弗洛里安