FYI: "fsck -y" on an external USB drive (USB-C, ext4) gave me a ton of messages : [ 191.261939] xhci_hcd 0000:05:00.0: WARN Wrong bounce buffer write length: 1024 != 0 [ 191.263743] xhci_hcd 0000:05:00.0: WARN Wrong bounce buffer write length: 1024 != 0 [ 191.263788] xhci_hcd 0000:05:00.0: WARN Wrong bounce buffer write length: 1024 != 0 [ 191.263840] xhci_hcd 0000:05:00.0: WARN Wrong bounce buffer write length: 1024 != 0 [ 191.266857] xhci_hcd 0000:05:00.0: WARN Wrong bounce buffer write length: 1024 != 0 : Related to 597c56e372dab2c7f79b8d700aad3a5deebf9d1b, AFAICT. Kernel is 4.19.67-1 (Debian proposed-updates). Regards Harri