root@raspberrypi:~# gpio -g read 38 0
While the hard drive is connected to the Pi and the blkid command is issued the drive does not appear:
root@raspberrypi:~# blkid /dev/mmcblk0p1: SEC_TYPE="msdos" LABEL="boot" UUID="35ED-46FE" TYPE="vfat" PARTUUID="6603105a-01" /dev/mmcblk0p2: UUID="443559ba-b80f-4fb6-99d9-ddbcd6138fbd" TYPE="ext4" PARTUUID="6603105a-02"
To turn on the GPIO pin 38 the config.txt file located in /boot has to be edited:
root@raspberrypi:~# nano /boot/config.txt
Add the following line to the bottom of the file:
max_usb_current=1
Reboot the Pi:
root@raspberrypi:~# reboot
Check to see if the GPIO pin 38 is set to on:
root@raspberrypi:~# gpio -g read 38 1
Check to see if the drive is visible:
root@raspberrypi:~# blkid /dev/mmcblk0p1: SEC_TYPE="msdos" LABEL="boot" UUID="35ED-46FE" TYPE="vfat" PARTUUID="6603105a-01" /dev/mmcblk0p2: UUID="443559ba-b80f-4fb6-99d9-ddbcd6138fbd" TYPE="ext4" PARTUUID="6603105a-02" /dev/sda1: LABEL="SAMSUNG" UUID="3C2C1AB02C1A6564" TYPE="ntfs" PARTUUID="efad9a84-01" /dev/mmcblk0: PTUUID="6603105a" PTTYPE="dos"
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