# Making WP7607 appear as mass storage device **URL:** \ **Category:** Legato Application Framework\ **Created:** [June 24, 2019, 8:15am UTC](https://forum.legato.io/t/making-wp7607-appear-as-mass-storage-device/4453 "2019-06-24T08:15:23Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![langestefan](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/langestefan/32/645_2.png) [@langestefan](https://forum.legato.io/u/langestefan)\ **Post date:** [June 24, 2019, 8:15am UTC](https://forum.legato.io/t/making-wp7607-appear-as-mass-storage-device/4453/1 "2019-06-24T08:15:24Z")
Hi, For a usecase I want my WP7607 to appear as a mass storage device when I plug it into a host PC (or any device that supports USB mass storage). I found an article that does this on a RPI: [MAKE A PI ZERO W SMART USB FLASH DRIVE](https://www.raspberrypi.org/magpi/pi-zero-w-smart-usb-flash-drive/) I understand that I need to do `modprobe g_mass_storage`. But modules.dep is empty so that command returns an error. I checked [Legato KConfig options](https://docs.legato.io/latest/kconfigDescription.html) but this doesn’t mention the option to customize any USB options. Is it possible to add mass storage support to Legato? If yes, how? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [June 26, 2019, 2:47am UTC](https://forum.legato.io/t/making-wp7607-appear-as-mass-storage-device/4453/2 "2019-06-26T02:47:20Z")
seems no such option in AT!USBCOMP=? at!usbcomp=? !USBCOMP: AT!USBCOMP=,, - configuration index to which the composition applies, should be 1 - 1:Generic - DIAG - 0x00000001, NMEA - 0x00000004, MODEM - 0x00000008, RAWDAT - 0x00000040, RMNET0 - 0x00000100, RMNET1 - 0x00000400, RMNET2 - 0x00000800, AUDIO - 0x00010000, ECM - 0x00080000, NCM - 0x00400000, e.g. 9 - diag,modem interfaces enabled 10D - diag,nmea,modem,rmnet0 interfaces enabled OK ---
**Author:** ![langestefan](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/langestefan/32/645_2.png) [@langestefan](https://forum.legato.io/u/langestefan)\ **Post date:** [June 26, 2019, 9:06am UTC](https://forum.legato.io/t/making-wp7607-appear-as-mass-storage-device/4453/3 "2019-06-26T09:06:07Z")
I know. But you can add it through KConfig, like this post: [https://forum.mangoh.io/t/build-linux-for-wp76/1084/3](https://forum.mangoh.io/t/build-linux-for-wp76/1084/3) I was hoping the same could be achieved for mass storage. Maybe @dfrey knows? ---
**Author:** ![mlw](https://avatars.discourse-cdn.com/v4/letter/m/8edcca/32.png) [@mlw](https://forum.legato.io/u/mlw)\ **Post date:** [June 28, 2019, 1:23pm UTC](https://forum.legato.io/t/making-wp7607-appear-as-mass-storage-device/4453/4 "2019-06-28T13:23:00Z")
@langestefan, So this is possible as per the below (not generated by me). Create an empty 32MB FAT image (in /tmp/fat.fs) using mkdosfs command: ``` dd if=/dev/zero of=/tmp/fat.fs bs=1024 count=32768 mkdosfs /tmp/fat.fs ``` Then mount this image in “/tmp/mass\_storage” in order to add some files. ``` mount -o loop /tmp/fat.fs /tmp/mass_storage echo "Hello World!" > /tmp/mass_storage/README.TXT ``` After that add/configure “mass\_storage” in the USB functions: ``` echo 0 > /sys/class/android_usb/android0/enable echo diag,serial,rmnet,ecm, **mass_storage** > /sys/class/android_usb/android0/functions echo /tmp/fat.fs > /sys/class/android_usb/android0/f_mass_storage/lun/file echo 1 > /sys/class/android_usb/android0/enable ``` After that, a new USB flash drive is visible on the host side (a PC in this case) with the expected content. Regards Matt ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 2, 2019, 1:48am UTC](https://forum.legato.io/t/making-wp7607-appear-as-mass-storage-device/4453/5 "2019-07-02T01:48:42Z")
it works! BTW, you can use the busybox here for mkdosfs command on WP76 [busybox-armv5l\_1.26](https://forum.legato.io/uploads/short-url/xUdxtSxERe1qEpAdYxqO7SkmhdZ.26) (1.1 MB) root@swi-mdm9x28-wp:~# chmod 777 busybox-armv5l\_1.26 root@swi-mdm9x28-wp:~# ./busybox-armv5l\_1.26 mkdosfs /tmp/fat.fs ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [August 6, 2026, 4:30am UTC](https://forum.legato.io/t/making-wp7607-appear-as-mass-storage-device/4453/6 "2026-08-06T04:30:13Z")
Here is an updated version of document which shows how to enumerate mass storage device for WP76 with FW R12 (kernel 3.18) and FW R17.1 (kernel 4.14) : > **["http post" on WP76xx](https://forum.sierrawireless.com/t/http-post-on-wp76xx/25601/11)** > > Here is an updated version of document which also shows how to enumerate mass storage device for WP76 with new FW R17.1: How to make WP76 module as mass storage device\_v2.docx (690.9 KB)