I believe I also have this issue - my 128G card is not automounted, and it's not possible to mount it.
I'm running 16.04.2, 4.4.0-79-generic, x86_64, and I have exfat-utils and fuse-exfat installed. fdisk shows the card as Disk /dev/sdh with only 1.9 MiB capacity, but below shows a filesystem on it of 119.2G, which I guess is correct if overhead is taken into account, and on /dev/sdh1. However, no sdh1 file exists on my filesystem in /dev. See the output of fdisk, parted and dmesg below: fdisk -l Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x0004006b Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 976895 974848 476M 83 Linux /dev/sda2 978942 1953523711 1952544770 931G 5 Extended /dev/sda5 978944 20508671 19529728 9.3G 82 Linux swap / Solaris /dev/sda6 20510720 117188607 96677888 46.1G 83 Linux /dev/sda7 117190656 1953523711 1836333056 875.6G 83 Linux Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x0004ce71 Device Boot Start End Sectors Size Id Type /dev/sdb1 63 1953520064 1953520002 931.5G 83 Linux Disk /dev/sdh: 1.9 MiB, 1966080 bytes, 3840 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000 Device Boot Start End Sectors Size Id Type /dev/sdh1 * 32768 250085375 250052608 119.2G 7 HPFS/NTFS/exFAT ------------------------------------------------------------------ root@host:/dev# ls -la /dev/ | grep sdh brw-rw---- 1 root disk 8, 112 Jun 7 13:46 sdh ------------------------------------------------------------------ parted -l Model: Generic USB SD Reader (scsi) Disk /dev/sdh: 1966kB Sector size (logical/physical): 512B/512B Partition Table: msdos Disk Flags: Number Start End Size Type File system Flags 1 16.8MB 128GB 128GB primary boot dmesg | tail [ 5479.652055] usb 2-1.6: USB disconnect, device number 7 [ 5484.971560] usb 2-1.6: new high-speed USB device number 8 using ehci-pci [ 5485.253163] usb 2-1.6: New USB device found, idVendor=1307, idProduct=0330 [ 5485.253170] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 5485.253175] usb 2-1.6: Product: Mass Storage Device [ 5485.253178] usb 2-1.6: Manufacturer: Generic [ 5485.253182] usb 2-1.6: SerialNumber: 00000000000006 [ 5485.253681] usb-storage 2-1.6:1.0: USB Mass Storage device detected [ 5485.254822] scsi host9: usb-storage 2-1.6:1.0 [ 5486.252509] scsi 9:0:0:0: Direct-Access Generic USB CF Reader 0.00 PQ: 0 ANSI: 2 [ 5487.117817] scsi 9:0:0:1: Direct-Access Generic USB SD Reader 0.00 PQ: 0 ANSI: 2 [ 5487.118642] scsi 9:0:0:2: Direct-Access Generic USB MS Reader 0.00 PQ: 0 ANSI: 2 [ 5487.119441] scsi 9:0:0:3: Direct-Access Generic USB SM Reader 0.00 PQ: 0 ANSI: 2 [ 5487.120291] sd 9:0:0:0: Attached scsi generic sg7 type 0 [ 5487.120628] sd 9:0:0:1: Attached scsi generic sg8 type 0 [ 5487.120917] sd 9:0:0:2: Attached scsi generic sg9 type 0 [ 5487.121289] sd 9:0:0:3: Attached scsi generic sg10 type 0 [ 5487.122089] sd 9:0:0:1: [sdh] 3840 512-byte logical blocks: (1.97 MB/1.88 MiB) [ 5487.125320] sd 9:0:0:2: [sdi] Attached SCSI removable disk [ 5487.125955] sd 9:0:0:1: [sdh] Write Protect is off [ 5487.125959] sd 9:0:0:1: [sdh] Mode Sense: 03 00 00 00 [ 5487.127195] sd 9:0:0:3: [sdj] Attached SCSI removable disk [ 5487.128440] sd 9:0:0:1: [sdh] No Caching mode page found [ 5487.128444] sd 9:0:0:1: [sdh] Assuming drive cache: write through [ 5487.137092] sd 9:0:0:0: [sdg] Attached SCSI removable disk [ 5487.142479] sdh: sdh1 [ 5487.142484] sdh: p1 start 32768 is beyond EOD, enabling native capacity [ 5487.145851] sdh: sdh1 [ 5487.145856] sdh: p1 start 32768 is beyond EOD, truncated [ 5487.148318] sd 9:0:0:1: [sdh] Attached SCSI removable disk -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1644981 Title: ExFAT Formatted SD Cards not mounted Status in linux package in Ubuntu: Confirmed Bug description: ExFAT formatted SD cards aren't mounted ob Ubuntu 16.04. The cards work perfectly on 12.04, 14.04 and Windows. Nov 26 11:21:22 bnasws02 kernel: [93798.228489] usb 1-8: new high-speed USB device number 7 using xhci_hcd Nov 26 11:21:22 bnasws02 kernel: [93798.358675] usb 1-8: New USB device found, idVendor=058f, idProduct=6366 Nov 26 11:21:22 bnasws02 kernel: [93798.358678] usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Nov 26 11:21:22 bnasws02 kernel: [93798.358680] usb 1-8: Product: Flash Card Reader/Writer Nov 26 11:21:22 bnasws02 kernel: [93798.358682] usb 1-8: Manufacturer: Generic Nov 26 11:21:22 bnasws02 kernel: [93798.358683] usb 1-8: SerialNumber: 058F63666485 Nov 26 11:21:22 bnasws02 kernel: [93798.359894] usb-storage 1-8:1.0: USB Mass Storage device detected Nov 26 11:21:22 bnasws02 kernel: [93798.359950] scsi host7: usb-storage 1-8:1.0 Nov 26 11:21:22 bnasws02 mtp-probe: checking bus 1, device 7: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8" Nov 26 11:21:22 bnasws02 mtp-probe: bus: 1, device: 7 was not an MTP device Nov 26 11:21:23 bnasws02 kernel: [93799.357754] scsi 7:0:0:0: Direct-Access Multiple Card Reader 1.00 PQ: 0 ANSI: 4 Nov 26 11:21:23 bnasws02 kernel: [93799.358491] sd 7:0:0:0: Attached scsi generic sg1 type 0 Nov 26 11:21:27 bnasws02 kernel: [93802.408280] sd 7:0:0:0: [sdb] Attached SCSI removable disk ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-generic 4.4.0.47.50 ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24 Uname: Linux 4.4.0-47-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sebastian 2240 F.... pulseaudio /dev/snd/controlC1: sebastian 2240 F.... pulseaudio CurrentDesktop: GNOME Date: Sat Nov 26 11:22:03 2016 HibernationDevice: RESUME=UUID=bdba64aa-c323-4ba7-a32d-bc49a2716cc7 InstallationDate: Installed on 2015-08-06 (477 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 007: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader Bus 001 Device 003: ID 064e:9700 Suyin Corp. Asus Integrated Webcam Bus 001 Device 002: ID 8087:0a2a Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: ASUSTeK COMPUTER INC. UX305LA ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-47-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-47-generic N/A linux-backports-modules-4.4.0-47-generic N/A linux-firmware 1.157.5 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-11-21 (4 days ago) dmi.bios.date: 07/06/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX305LA.204 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX305LA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: ATN12345678901234567 dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX305LA.204:bd07/06/2015:svnASUSTeKCOMPUTERINC.:pnUX305LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX305LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: UX305LA dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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