{"id":2946,"date":"2016-05-07T07:34:36","date_gmt":"2016-05-07T13:34:36","guid":{"rendered":"http:\/\/dev.iachieved.it\/iachievedit\/?p=2946"},"modified":"2020-09-05T16:27:03","modified_gmt":"2020-09-05T21:27:03","slug":"expanding-your-beaglebone-microsd-filesystem","status":"publish","type":"post","link":"https:\/\/dev.iachieved.it\/iachievedit\/expanding-your-beaglebone-microsd-filesystem\/","title":{"rendered":"Expanding your BeagleBone microSD Filesystem"},"content":{"rendered":"

There are a number of tutorials out there that show you how to expand a BeagleBone Black microSD-based filesystem. Most of them were written, however, when the delivered image from BeagleBoard.org<\/a> contained two partitions: one a FAT partition, the other your standard Linux partition.<\/p>\n

The aim of this post is to show you that indeed, you have nothing to fear expanding your BeagleBone Black partition even though there is only one (if you’re like us you get a little nervous when someone asks you to delete the partition you booted in).<\/p>\n

Editor’s Note:<\/b> I have updated this post for use with the latest BeagleBone Black IoT images which does require attention to the starting sector.<\/p>\n

Let’s get started. We’re using the Debian 10.3 IoT 2020-04-06 4GB<\/a> image from BeagleBoard.org. As you can see with df<\/code> it’s a 4G (3.4G) filesystem, even though we just flashed it onto an 8GB microSD card:<\/p>\n

\ndebian@beaglebone:~$ df -h \/\nFilesystem      Size  Used Avail Use% Mounted on\n\/dev\/mmcblk0p1  3.4G  1.9G  1.4G  57% \/\n<\/pre>\n
The filesystem is on the mmcblk0<\/code> device, so we’ll use fdisk<\/code> to repartition:<\/p>\n
\ndebian@beaglebone:~$ sudo fdisk \/dev\/mmcblk0\n\nWelcome to fdisk (util-linux 2.33.1).\nChanges will remain in memory only, until you decide to write them.\nBe careful before using the write command.\n\n<\/pre>\n
Use the p<\/b> command to print<\/b> the current partition table.  As expected, we see that the device itself has 8GB of space (well, 7.4), but our only partition is 3.5G.<\/p>\n
\nCommand (m for help): p\nDisk \/dev\/mmcblk0: 7.4 GiB, 7948206080 bytes, 15523840 sectors\nUnits: sectors of 1 * 512 = 512 bytes\nSector size (logical\/physical): 512 bytes \/ 512 bytes\nI\/O size (minimum\/optimal): 512 bytes \/ 512 bytes\nDisklabel type: dos\nDisk identifier: 0x3244345d\n\nDevice         Boot Start     End Sectors  Size Id Type\n\/dev\/mmcblk0p1 *     8192 7372799 7364608  3.5G 83 Linux\n<\/pre>\n
Write down the starting sector as you will<\/em> need it below.  In our case it is 8192.<\/p>\n
Now, the “scary” part.  Enter d<\/b> to delete your partition.<\/p>\n
\nCommand (m for help): d\nSelected partition 1\nPartition 1 has been deleted.\n<\/pre>\n
Don’t worry, we’re adding it right back, with a size larger than the existing one.  Enter n<\/b> for New partition, and then p<\/b> for primary partition.<\/p>\n
\nCommand (m for help): n\nPartition type\n   p   primary (0 primary, 0 extended, 4 free)\n   e   extended (container for logical partitions)\nSelect (default p): p\n<\/pre>\n
At this point hit Enter<\/b> at each prompt to accept the defaults, with the exception of the First Sector<\/b> which you will need the value you wrote down from above.  When prompted whether or not you want to remove the ext4 signature, type N<\/b>.<\/p>\n
\nPartition number (1-4, default 1): \nFirst sector (2048-15523839, default 2048): 8192\nLast sector, +\/-sectors or +\/-size{K,M,G,T,P} (8192-15523839, default 15523839): \n\nCreated a new partition 1 of type 'Linux' and of size 7.4 GiB.\nPartition #1 contains a ext4 signature.\n\nDo you want to remove the signature? [Y]es\/[N]o: N\n<\/pre>\n
Use p<\/b> once more to print out the partition table:<\/p>\n
\nCommand (m for help): p\nDisk \/dev\/mmcblk0: 7.4 GiB, 7948206080 bytes, 15523840 sectors\nUnits: sectors of 1 * 512 = 512 bytes\nSector size (logical\/physical): 512 bytes \/ 512 bytes\nI\/O size (minimum\/optimal): 512 bytes \/ 512 bytes\nDisklabel type: dos\nDisk identifier: 0x3244345d\n\nDevice         Boot Start      End  Sectors  Size Id Type\n\/dev\/mmcblk0p1       8192 15523839 15515648  7.4G 83 Linux\n<\/pre>\n
Now press w<\/b> (for write<\/b>) and get another scary warning:<\/p>\n
\nThe partition table has been altered.\nCalling ioctl() to re-read partition table.\nRe-reading the partition table failed.: Device or resource busy\n\nThe kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).\n<\/pre>\n
You can now use resize2fs<\/code> to resize your partition:<\/p>\n
\ndebian@beaglebone:~$ sudo resize2fs \/dev\/mmcblk0p1\nresize2fs 1.42.12 (29-Aug-2014)\nFilesystem at \/dev\/mmcblk0p1 is mounted on \/; on-line resizing required\nold_desc_blocks = 1, new_desc_blocks = 1\nThe filesystem on \/dev\/mmcblk0p1 is now 1940224 (4k) blocks long.\n<\/pre>\n
Use df -h \/<\/code> again and verify that you have reclaimed the unused space on your SD card.<\/p>\n
\nFilesystem      Size  Used Avail Use% Mounted on\n\/dev\/mmcblk0p1  7.3G  1.9G  5.1G  27% \/\n<\/pre>\n
And that’s it!  No reboot required, and you can enjoy the full capacity of your microSD card.<\/p>\n","protected":false},"excerpt":{"rendered":"
There are a number of tutorials out there that show you how to expand a BeagleBone Black microSD-based filesystem. Most of them were written, however, when the delivered image from BeagleBoard.org contained two partitions: one a FAT partition, the other your standard Linux partition. The aim of this post is to show you that indeed, […]<\/p>\n","protected":false},"author":1,"featured_media":2944,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-2946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-beaglebone"],"_links":{"self":[{"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/posts\/2946"}],"collection":[{"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/comments?post=2946"}],"version-history":[{"count":13,"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/posts\/2946\/revisions"}],"predecessor-version":[{"id":4179,"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/posts\/2946\/revisions\/4179"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/media\/2944"}],"wp:attachment":[{"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/media?parent=2946"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/categories?post=2946"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dev.iachieved.it\/iachievedit\/wp-json\/wp\/v2\/tags?post=2946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}