SD Card
The SD card (Secure Digital Card) is a widely used portable storage medium, featuring compact size, large storage capacity, low power consumption, and ease of use. It is commonly employed in mobile phones, cameras, embedded devices, and single-board computers for storing system files, applications, and data content, and stands as one of the most prevalent storage solutions in modern mobile and embedded devices.
The Quectel Pi H1 single-board computer has a built-in push-type SD card slot that complies with the SD 3.0 standard.
Hardware Interface
Insert the SD card into the SD card slot of the Quectel Pi H1 single-board computer.
Basic Functionality
System Recognition
After inserting the SD card, you can use the following command to confirm whether the system recognizes the device:
lsblk
Output：
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 116.1G 0 disk
|-sda1 8:1 0 512M 0 part /efi
|-sda2 8:2 0 30M 0 part /var/persist
`-sda3 8:3 0 115.6G 0 part /
sdb 8:16 0 8M 0 disk
|-sdb1 8:17 0 3.5M 0 part
|-sdb2 8:18 0 512K 0 part
`-sdb3 8:19 0 3.5M 0 part
sdc 8:32 0 8M 0 disk
|-sdc1 8:33 0 3.5M 0 part
|-sdc2 8:34 0 512K 0 part
`-sdc3 8:35 0 3.5M 0 part
sdd 8:48 0 32M 0 disk
|-sdd1 8:49 0 104K 0 part
|-sdd2 8:50 0 128K 0 part
|-sdd3 8:51 0 1M 0 part
|-sdd4 8:52 0 1M 0 part
`-sdd5 8:53 0 1M 0 part
sde 8:64 0 3G 0 disk
|-sde1 8:65 0 512K 0 part
|-sde2 8:66 0 64M 0 part
|-sde3 8:67 0 256K 0 part
|-sde4 8:68 0 2M 0 part
|-sde5 8:69 0 5M 0 part
|-sde6 8:70 0 4M 0 part
|-sde7 8:71 0 8M 0 part
|-sde8 8:72 0 4M 0 part
|-sde9 8:73 0 32M 0 part
|-sde10 8:74 0 128K 0 part
|-sde11 8:75 0 80K 0 part
|-sde12 8:76 0 2M 0 part
|-sde13 8:77 0 2M 0 part
|-sde14 8:78 0 128K 0 part
|-sde15 8:79 0 32K 0 part
|-sde16 259:0 0 1M 0 part
|-sde17 259:1 0 256K 0 part
|-sde18 259:2 0 512K 0 part
|-sde19 259:3 0 256K 0 part
|-sde20 259:4 0 64M 0 part
|-sde21 259:5 0 2M 0 part
|-sde22 259:6 0 5M 0 part
|-sde23 259:7 0 4M 0 part
|-sde24 259:8 0 8M 0 part
|-sde25 259:9 0 4M 0 part
|-sde26 259:10 0 32M 0 part
|-sde27 259:11 0 128K 0 part
|-sde28 259:12 0 80K 0 part
|-sde29 259:13 0 2M 0 part
|-sde30 259:14 0 2M 0 part
|-sde31 259:15 0 128K 0 part
|-sde32 259:16 0 32K 0 part
|-sde33 259:17 0 1M 0 part
|-sde34 259:18 0 256K 0 part
|-sde35 259:19 0 4K 0 part
|-sde36 259:20 0 4K 0 part
|-sde37 259:21 0 4K 0 part
|-sde38 259:22 0 16M 0 part
|-sde39 259:23 0 30M 0 part
|-sde40 259:24 0 1M 0 part
|-sde41 259:25 0 32.6M 0 part
|-sde42 259:26 0 4K 0 part
|-sde43 259:27 0 4K 0 part
|-sde44 259:28 0 1M 0 part
|-sde45 259:29 0 8M 0 part
|-sde46 259:30 0 40M 0 part
|-sde47 259:31 0 512M 0 part
|-sde48 259:32 0 28K 0 part
|-sde49 259:33 0 512K 0 part
|-sde50 259:34 0 1M 0 part
`-sde51 259:35 0 32.6M 0 part
sdf 8:80 0 32M 0 disk
|-sdf1 8:81 0 3M 0 part
|-sdf2 8:82 0 3M 0 part
|-sdf3 8:83 0 3M 0 part
`-sdf4 8:84 0 128K 0 part
mmcblk1 179:0 0 29.5G 0 disk
`-mmcblk1p1 179:1 0 29.5G 0 part /media/sdcard
zram0 253:0 0 3.8G 0 disk [SWAP]
Mounting and Unmounting
mmcblk1 179:0 0 29.5G 0 disk
`-mmcblk1p1 179:1 0 29.5G 0 part /media/sdcard
The SD card is automatically mounted at /media/sdcard.
Check the mount result:
ls /media/sdcard
Mount to another directory:
sudo mkdir -p /mnt/sdcard
sudo mount /dev/mmcblk1p1 /mnt/sdcard
Check the mount result:
ls /mnt/sdcard
After use, unmount:
sudo umount /mnt/sdcard
Tip: Unmount the SD card before removing it to prevent data corruption.
File Operations and Permissions
When a regular user accesses the SD card, permission issues may occur. You can change the owner of the mount directory using the following commands:
sudo chown <username> /mnt/sdcard
sudo chmod 755 /mnt/sdcard
Replace <username> with the currently logged-in username. After this, you can read and write files normally in the /mnt/sdcard directory.