I have drives showing up and disappearing on and off. Timing is always different but sometimes it works sometimes it doesn’t…
dmesg
[ 2228.900163] usb 2-1: UAS is ignored for this device, using usb-storage instead
[ 2228.900304] usb 2-1: UAS is ignored for this device, using usb-storage instead
[ 2228.900327] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 2228.900851] usb-storage 2-1:1.0: Quirks match for vid 152d pid 0561: 800000
[ 2228.901031] scsi host2: usb-storage 2-1:1.0
[ 2229.936059] scsi 2:0:0:0: Direct-Access JMicron Tech 8136 PQ: 0 ANSI: 6
[ 2229.936694] sd 2:0:0:0: Attached scsi generic sg1 type 0
[ 2229.938126] scsi 2:0:0:1: Direct-Access JMicron Tech 8136 PQ: 0 ANSI: 6
[ 2229.938777] sd 2:0:0:1: Attached scsi generic sg3 type 0
[ 2229.938959] sd 2:0:0:0: [sdd] Very big device. Trying to use READ CAPACITY(16).
[ 2229.939910] sd 2:0:0:0: [sdd] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 2229.940700] sd 2:0:0:0: [sdd] Write Protect is off
[ 2229.940719] sd 2:0:0:0: [sdd] Mode Sense: 47 00 10 08
[ 2229.941485] sd 2:0:0:0: [sdd] No Caching mode page found
[ 2229.941503] sd 2:0:0:0: [sdd] Assuming drive cache: write through
[ 2229.942024] sd 2:0:0:1: [sde] Very big device. Trying to use READ CAPACITY(16).
[ 2229.942513] sd 2:0:0:1: [sde] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 2229.943249] sd 2:0:0:1: [sde] Write Protect is off
[ 2229.943267] sd 2:0:0:1: [sde] Mode Sense: 47 00 10 08
[ 2229.944030] sd 2:0:0:1: [sde] No Caching mode page found
[ 2229.944047] sd 2:0:0:1: [sde] Assuming drive cache: write through
[ 2230.119547] sde: sde1 sde2
[ 2230.119783] sdd: sdd1
[ 2230.124602] sd 2:0:0:1: [sde] Attached SCSI disk
[ 2230.125442] sd 2:0:0:0: [sdd] Attached SCSI disk
[ 2230.585922] usb 2-1: reset SuperSpeed Gen 1 USB device number 53 using xhci_hcd
[ 2230.616273] usb 2-1: device firmware changed
[ 2230.620828] sd 2:0:0:1: [sde] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 cmd_age=0s
[ 2230.620842] sd 2:0:0:1: [sde] tag#0 CDB: opcode=0x88 88 00 00 00 00 01 d1 c0 b7 80 00 00 00 08 00 00
[ 2230.620849] usb 2-1: USB disconnect, device number 53
[ 2230.620855] print_req_error: 3 callbacks suppressed
[ 2230.620862] blk_update_request: I/O error, dev sde, sector 7814035328 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 2230.621025] sd 2:0:0:0: [sdd] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 cmd_age=0s
[ 2230.621036] sd 2:0:0:0: [sdd] tag#0 CDB: opcode=0x88 88 00 00 00 00 01 d1 c0 be 00 00 00 00 08 00 00
[ 2230.621048] blk_update_request: I/O error, dev sdd, sector 7814036992 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 2230.621138] sd 2:0:0:1: [sde] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 cmd_age=0s
[ 2230.621150] sd 2:0:0:1: [sde] tag#0 CDB: opcode=0x88 88 00 00 00 00 00 00 03 ff a2 00 00 00 08 00 00
[ 2230.621161] blk_update_request: I/O error, dev sde, sector 262050 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 2230.621230] blk_update_request: I/O error, dev sdd, sector 7814036992 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 2230.621241] Buffer I/O error on dev sdd1, logical block 7814034944, async page read
[ 2230.621260] blk_update_request: I/O error, dev sdd, sector 7814036993 op 0x0:(READ) flags 0x0 phys_seg 7 prio class 0
[ 2230.621270] Buffer I/O error on dev sdd1, logical block 7814034945, async page read
[ 2230.621280] Buffer I/O error on dev sdd1, logical block 7814034946, async page read
[ 2230.621290] Buffer I/O error on dev sdd1, logical block 7814034947, async page read
[ 2230.621302] Buffer I/O error on dev sdd1, logical block 7814034948, async page read
[ 2230.621312] Buffer I/O error on dev sdd1, logical block 7814034949, async page read
[ 2230.621322] Buffer I/O error on dev sdd1, logical block 7814034950, async page read
[ 2230.621332] Buffer I/O error on dev sdd1, logical block 7814034951, async page read
[ 2230.621374] sd 2:0:0:1: [sde] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00 cmd_age=0s
[ 2230.621384] sd 2:0:0:1: [sde] tag#0 CDB: opcode=0x88 88 00 00 00 00 01 d1 c0 b7 80 00 00 00 08 00 00
[ 2230.621395] blk_update_request: I/O error, dev sde, sector 7814035328 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 2230.621404] Buffer I/O error on dev sde2, logical block 976721392, async page read
[ 2230.621457] sd 2:0:0:1: [sde] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00 cmd_age=0s
[ 2230.621468] sd 2:0:0:1: [sde] tag#0 CDB: opcode=0x88 88 00 00 00 00 00 00 03 ff a2 00 00 00 08 00 00
[ 2230.621478] blk_update_request: I/O error, dev sde, sector 262050 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 2230.621487] Buffer I/O error on dev sde1, logical block 32752, async page read
[ 2231.175643] usb 2-1: new SuperSpeed Gen 1 USB device number 54 using xhci_hcd
[ 2231.206900] usb 2-1: New USB device found, idVendor=152d, idProduct=0561, bcdDevice=81.36
[ 2231.206917] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=5
[ 2231.206931] usb 2-1: Product: External Disk 3.0
[ 2231.206944] usb 2-1: Manufacturer: JMicron
[ 2231.206958] usb 2-1: SerialNumber: RANDOM__A8DEEF5DA531
[ 2231.210895] usb 2-1: UAS is ignored for this device, using usb-storage instead
[ 2231.210997] usb 2-1: UAS is ignored for this device, using usb-storage instead
[ 2231.211013] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 2231.211418] usb-storage 2-1:1.0: Quirks match for vid 152d pid 0561: 800000
[ 2231.211556] scsi host2: usb-storage 2-1:1.0
[ 2232.256094] scsi 2:0:0:0: Direct-Access JMicron Tech 8136 PQ: 0 ANSI: 6
[ 2232.256750] sd 2:0:0:0: Attached scsi generic sg1 type 0
[ 2232.257185] sd 2:0:0:0: [sdd] Very big device. Trying to use READ CAPACITY(16).
[ 2232.257472] sd 2:0:0:0: [sdd] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 2232.258257] sd 2:0:0:0: [sdd] Write Protect is off
[ 2232.258276] sd 2:0:0:0: [sdd] Mode Sense: 47 00 10 08
[ 2232.261264] sd 2:0:0:0: [sdd] No Caching mode page found
[ 2232.261281] sd 2:0:0:0: [sdd] Assuming drive cache: write through
[ 2232.265377] scsi 2:0:0:1: Direct-Access JMicron Tech 8136 PQ: 0 ANSI: 6
[ 2232.266207] scsi 2:0:0:1: Attached scsi generic sg3 type 0
[ 2232.270101] sd 2:0:0:1: [sde] Very big device. Trying to use READ CAPACITY(16).
[ 2232.270384] sd 2:0:0:1: [sde] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 2232.275154] sd 2:0:0:1: [sde] Write Protect is off
[ 2232.275173] sd 2:0:0:1: [sde] Mode Sense: 47 00 10 08
[ 2232.276091] sd 2:0:0:1: [sde] No Caching mode page found
[ 2232.276109] sd 2:0:0:1: [sde] Assuming drive cache: write through
[ 2232.310249] sdd: sdd1
[ 2232.313248] sd 2:0:0:0: [sdd] Attached SCSI disk
[ 2232.335580] sde: sde1 sde2
[ 2232.338830] sd 2:0:0:1: [sde] Attached SCSI disk
[ 2232.565922] usb 2-1: reset SuperSpeed Gen 1 USB device number 54 using xhci_hcd
[ 2232.606288] usb 2-1: device firmware changed
[ 2232.614526] usb 2-1: USB disconnect, device number 54
[ 2232.615218] sd 2:0:0:0: [sdd] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 cmd_age=0s
[ 2232.615230] sd 2:0:0:0: [sdd] tag#0 CDB: opcode=0x88 88 00 00 00 00 01 d1 c0 be 00 00 00 00 08 00 00
[ 2232.615241] blk_update_request: I/O error, dev sdd, sector 7814036992 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 2232.738731] sd 2:0:0:1: [sde] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00 cmd_age=0s
[ 2232.738744] sd 2:0:0:1: [sde] tag#0 CDB: opcode=0x88 88 00 00 00 00 00 00 03 ff a2 00 00 00 08 00 00
[ 2232.738755] blk_update_request: I/O error, dev sde, sector 262050 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 2232.738816] sd 2:0:0:1: [sde] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00 cmd_age=0s
[ 2232.738828] sd 2:0:0:1: [sde] tag#0 CDB: opcode=0x88 88 00 00 00 00 01 d1 c0 b7 80 00 00 00 08 00 00
[ 2232.738838] blk_update_request: I/O error, dev sde, sector 7814035328 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0