# \[NCP\] Mounting of USB drive fails: "unknown filesystem type 'btrfs'."

**URL:** <https://help.nextcloud.com/t/ncp-mounting-of-usb-drive-fails-unknown-filesystem-type-btrfs/69988>\
**Category:** 📦 Appliances (Docker, Snappy, VM, NCP, AIO)\
**Tags:** ncp\
**Created:** [February 2, 2020, 8:31pm UTC](https://help.nextcloud.com/t/ncp-mounting-of-usb-drive-fails-unknown-filesystem-type-btrfs/69988 "2020-02-02T20:31:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jonaskor](https://help.nextcloud.com/letter_avatar/jonaskor/32/6_22734026db12803ebb3e059622ac3534.png) [@jonaskor](https://help.nextcloud.com/u/jonaskor)\
**Post date:** [February 2, 2020, 8:31pm UTC](https://help.nextcloud.com/t/ncp-mounting-of-usb-drive-fails-unknown-filesystem-type-btrfs/69988/1 "2020-02-02T20:31:22Z")

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Hello everyone 🙂 New day, new problem 😉

Just wanted to start fresh with my new Raspberry Pi 4 and a 375GB WD USB drive.  
Installed NCP without problems and went to the web interface (first tried the wizard) to format the connected drive. That apparently worked:

```
[nc-format-USB]
/dev/sda: 8 bytes were erased at offset 0x00000200 (gpt): 45 46 49 20 50 41 52 54
/dev/sda: 8 bytes were erased at offset 0x5752affe00 (gpt): 45 46 49 20 50 41 52 54
/dev/sda: 2 bytes were erased at offset 0x000001fe (PMBR): 55 aa
WARNING: failed to open /dev/btrfs-control, skipping device registration: No such device
Drive sda formatted successfuly and labeled myCloudDrive

```

What did not work was the mounting of the drive afterwards. That failed through the wizard so I tried to do it manually:

```
pi@nextcloudpi:/ $ lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
sda
└─sda1 btrfs myCloudDrive e8064185-b13c-472c-91e0-3565adc70e49
mmcblk0
├─mmcblk0p1 vfat boot 5203-DB74 199.9M 21% /boot
└─mmcblk0p2 ext4 rootfs 2ab3f8e1-7dc6-43f5-b0db-dd5759d51d4e 4.7G 28% /
pi@nextcloudpi:/ $ sudo mkdir /media/USBdrive
pi@nextcloudpi:/ $ sudo mount /dev/sda1 /media/USBdrive
mount: /media/USBdrive: unknown filesystem type 'btrfs'.

```

Apparently the filesystem of the freshly formatted drive can not be recognized by the Pi. How is that possible? Or is there anything else I missed?  
@nachoparker@OliverV

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<div class="post-metadata">

**Author:** ![jonaskor](https://help.nextcloud.com/letter_avatar/jonaskor/32/6_22734026db12803ebb3e059622ac3534.png) [@jonaskor](https://help.nextcloud.com/u/jonaskor)\
**Post date:** [February 3, 2020, 2:17pm UTC](https://help.nextcloud.com/t/ncp-mounting-of-usb-drive-fails-unknown-filesystem-type-btrfs/69988/2 "2020-02-03T14:17:36Z")

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Okay, after updating to the newest NCP version (1.20.7) the drive is mounted correctly and moving the data directory worked fine. 🙂

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**Author:** ![wwe](https://help.nextcloud.com/user_avatar/help.nextcloud.com/wwe/32/72963_2.png) [@wwe](https://help.nextcloud.com/u/wwe)\
**Post date:** [December 11, 2024, 8:29pm UTC](https://help.nextcloud.com/t/ncp-mounting-of-usb-drive-fails-unknown-filesystem-type-btrfs/69988/3 "2024-12-11T20:29:00Z")

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<div class="post-metadata">

**Author:** ![wwe](https://help.nextcloud.com/user_avatar/help.nextcloud.com/wwe/32/72963_2.png) [@wwe](https://help.nextcloud.com/u/wwe)\
**Post date:** [December 11, 2024, 8:29pm UTC](https://help.nextcloud.com/t/ncp-mounting-of-usb-drive-fails-unknown-filesystem-type-btrfs/69988/4 "2024-12-11T20:29:02Z")

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