I have a system76 laptop two disk drives and mint 19.1 installed I think it's possible that /dev/sdb2 is faulty. I found smartmontools.org and ran their command resulting in "A mandatory SMART command failed ...." Also ran Gparted but /dev/sdb2 did not appear and smartctl which failed bill@billsystem76:~$ sudo smartctl -i /dev/sdb2 smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.15.0-46-generic] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org Short INQUIRY response, skip product id A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options. Maybe this explains all the error messages about sdb2 contained in dmesg that I ran yesterday: bill@billsystem76:~/Desktop$ grep "error" log.txt [ 5.161663] pcieport 0000:00:1c.0: AER: Multiple Corrected error received: id=00e0 [ 5.185817] pcieport 0000:00:1c.0: device [8086:9d10] error status/mask=00000001/00002000 [ 64.632457] EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro [50753.995092] logitech-hidpp-device 0003:046D:400A.0004: hidpp20_batterylevel_get_battery_capacity: received protocol error 0x09 [90957.834206] iwlwifi 0000:3b:00.0: Microcode SW error detected. Restarting 0x2000000. [93493.852355] iwlwifi 0000:3b:00.0: Microcode SW error detected. Restarting 0x2000000. [166318.695908] iwlwifi 0000:3b:00.0: Microcode SW error detected. Restarting 0x2000000. [168811.626553] iwlwifi 0000:3b:00.0: Microcode SW error detected. Restarting 0x2000000. [172686.680832] EXT4-fs (sdb2): warning: mounting fs with errors, running e2fsck is recommended [172687.009358] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.378621] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.400586] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.422627] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.444962] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.466505] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.488495] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.510471] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.532759] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172687.554441] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.141345] print_req_error: I/O error, dev sdb, sector 1050624 [172831.141355] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.141402] print_req_error: I/O error, dev sdb, sector 974391296 [172831.141406] Buffer I/O error on dev sdb2, logical block 121667584, lost sync page write [172831.141528] print_req_error: I/O error, dev sdb, sector 974391296 [172831.141533] EXT4-fs error: 49 callbacks suppressed [172831.141538] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.141545] print_req_error: I/O error, dev sdb, sector 974391296 [172831.141550] Buffer I/O error on dev sdb2, logical block 121667584, lost sync page write [172831.141564] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.141625] print_req_error: I/O error, dev sdb, sector 1050624 [172831.141633] print_req_error: I/O error, dev sdb, sector 1050624 [172831.141638] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.141940] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.141949] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.141998] print_req_error: I/O error, dev sdb, sector 1050624 [172831.142006] print_req_error: I/O error, dev sdb, sector 1050624 [172831.142010] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.142146] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.142156] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.142209] print_req_error: I/O error, dev sdb, sector 1050624 [172831.142218] print_req_error: I/O error, dev sdb, sector 1050624 [172831.142223] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.142356] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.142367] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.142423] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.142563] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.142574] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.142633] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.142885] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.142893] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.142940] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.143082] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.143092] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.143152] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172831.143293] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.143304] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.143477] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.143488] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.143773] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm gvfs-udisks2-vo: checksumming directory block 0 [172831.143780] EXT4-fs (sdb2): previous I/O error to superblock detected [172831.210723] EXT4-fs error (device sdb2): ext4_journal_check_start:61: Detected aborted journal [172861.813065] EXT4-fs error: 138 callbacks suppressed [172861.813067] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813080] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813154] print_req_error: 332 callbacks suppressed [172861.813155] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813165] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813168] buffer_io_error: 143 callbacks suppressed [172861.813170] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813253] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813257] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813274] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813278] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813280] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813293] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813295] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813307] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813310] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813312] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813322] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813325] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813336] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813339] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813341] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813416] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813419] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813432] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813435] print_req_error: I/O error, dev sdb, sector 1050624 [172861.813437] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813475] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813478] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813494] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813505] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813508] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813520] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813530] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813533] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813545] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813579] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813582] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813597] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172861.813632] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172861.813635] EXT4-fs (sdb2): previous I/O error to superblock detected [172861.813667] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.769800] EXT4-fs error: 31 callbacks suppressed [172905.769803] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.769815] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.769899] print_req_error: 178 callbacks suppressed [172905.769902] print_req_error: I/O error, dev sdb, sector 1050624 [172905.769913] print_req_error: I/O error, dev sdb, sector 1050624 [172905.769917] buffer_io_error: 31 callbacks suppressed [172905.769920] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770027] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770034] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770072] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770079] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770083] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770109] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770115] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770139] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770145] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770149] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770170] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770176] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770199] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770204] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770208] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770289] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770296] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770325] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770331] print_req_error: I/O error, dev sdb, sector 1050624 [172905.770335] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770415] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770422] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770456] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770479] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770485] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770511] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770532] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770537] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770562] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770634] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770641] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770672] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172905.770745] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [172905.770752] EXT4-fs (sdb2): previous I/O error to superblock detected [172905.770786] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [172987.789166] EXT4-fs (sdb2): error count since last fsck: 868 [172987.789171] EXT4-fs (sdb2): initial error at time 1552741304: ext4_validate_inode_bitmap:101 [172987.789176] EXT4-fs (sdb2): last error at time 1553882112: ext4_find_entry:1447: inode 3932161 [173708.044455] EXT4-fs error: 124 callbacks suppressed [173708.044457] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044463] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044495] print_req_error: 645 callbacks suppressed [173708.044496] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044501] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044503] buffer_io_error: 124 callbacks suppressed [173708.044504] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044542] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044545] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044558] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044561] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044562] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044572] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044574] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044583] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044585] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044587] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044595] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044597] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044605] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044608] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044609] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044638] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044641] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044651] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044653] print_req_error: I/O error, dev sdb, sector 1050624 [173708.044655] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044684] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044687] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044699] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044708] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044710] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044720] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044728] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044730] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044739] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044767] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044769] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044780] Buffer I/O error on dev sdb2, logical block 0, lost sync page write [173708.044807] EXT4-fs error (device sdb2): ext4_find_entry:1447: inode #3932161: comm pool: checksumming directory block 0 [173708.044810] EXT4-fs (sdb2): previous I/O error to superblock detected [173708.044822] Buffer I/O error on dev sdb2, logical block 0, lost sync page write