# -  - #
# -  - #
# -  - #
https://www.cyberciti.biz/faq/howto-create-lage-files-with-dd-command/





:Option 1
# -  - #
# - dd command - #



:A
# -  - #
# - Create data directory - #
mkdir /home/Data/DataDisk;



:B
# -  - #
# - Create 10Gb file - #
dd if=/dev/zero of=/home/Data/DataDisk/DataDisk1.img bs=1 count=0 seek=10G


bs=1G  -  5 blocks of 1 GB each
dd if=/dev/zero of=/home/Data/DataDisk/DataDisk1.img bs=1G count=5



:a
# -  - #
# - Create 1Mb (1024Kb) file - #
dd if=/dev/zero of=/home/Data/DataDisk/DataDisk1.img bs=1024 count=0 seek=1024

:b
# -  - #
# - Create 10Mb file - #
dd if=/dev/zero of=/home/Data/DataDisk/DataDisk1.img bs=1024 count=0 seek=$[1024*10]

:c
# -  - #
# - Create 100Mb file - #
dd if=/dev/zero of=/home/Data/DataDisk/DataDisk1.img bs=1024 count=0 seek=$[1024*100]

:d
# -  - #
# - Create 1Gb file - #
sudo dd if=/dev/zero of=/home/Data/DataDisk/DataDisk2.img bs=1 count=0 seek=1G

sudo dd if=/dev/zero of=/home/Data/DataDisk/DataDisk3.img bs=1G count=1

1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 8.60614 s, 125 MB/s

if=/dev/zero:   Input device/file
of=/dev/file:   Output device/file
     bs=512k:   Sets the block size to 512k

:e
# -  - #
# - Check file - #
ls -lh DataDisk1.img;
df -H DataDisk1.img;
df -h DataDisk1.img;
df -h DataDisk*;
df -H DataDisk*;
lsblk;


:f
# -  - #
# - Verify block allocation - #
stat DataDisk1.img
sudo du -h DataDisk1.img



:C
# -  - #
# - Format image - #
sudo mkfs.ext4 -F /home/Data/DataDisk/DataDisk1.img;



:D
# -  - #
# - Crate folder to mount file image - #
mkdir /home/Data/DataDisk/DataMount1



:E
# -  - #
# - Mount file image(partition) onto mounting folder - #

:a
# -  - #
# - Mount file onto partition - #
sudo mount -o loop /home/Data/DataDisk/DataDisk1.img /home/Data/DataDisk/DataMount1;

:a
# -  - #
# - Show mounting points - #
lsblk;

:c
# -  - #
# - Change permissions to folder - #
sudo chmod 777 DataMount2

:d
# -  - #
# - Unmount partition - #
sudo umount /home/Data/DataDisk/DataMount2;



:F
# -  - #
# - Permanent mounting on fstab - #
# - Mount file image(partition) onto mounting folder - #

:a
# -  - #
# - .img files ext4 - #

/home/Data/DataDisk/DataDisk1.img /home/Data/DataDisk/DataMount1 auto defaults 0 0







:Option 2
# -  - #
# - fallocate command - #
https://www.cyberciti.biz/faq/howto-create-lage-files-with-dd-command/


:A
# -  - #
# - Create file - #
sudo fallocate -l 10G DataDisk2.img;
sudo fallocate -l 10G DataDisk3.img;
sudo fallocate -l 10G DataDisk4.img;

sudo fallocate -l 100M DataDisk2.img;

:a
# -  - #
# - Suffices to use - #
k: KiB
m: MiB
g: GiB
t: TiB
p: PiB
e: etc



:B
# -  - #
# - List it - #
ls -lh DataDisk2.img;

-rw-r--r--. 1 root root 1.0G Nov 27 03:42 DataDisk2.img



:C
# -  - #
# - Status file - #
stat DataDisk2.img 

  File: DataDisk2.img
  Size: 10737418240	Blocks: 139736     IO Block: 4096   regular file
Device: 811h/2065d	Inode: 6291459     Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2020-05-01 23:12:01.123069722 +0000
Modify: 2020-05-01 23:15:48.304960206 +0000
Change: 2020-05-01 23:15:48.304960206 +0000
 Birth: -



:D
# -  - #
# - du command - #
sudo du -h DataDisk2.img

69M	DataDisk2.img



:E
# -  - #
# - Format image - #
sudo mkfs.ext4 -F /home/Data/DataDisk/DataDisk2.img;



:F
# -  - #
# - Mount file image(partition) onto mounting folder - #

:a
# -  - #
# - Mount file onto partition - #
sudo mount -o loop /home/Data/DataDisk/DataDisk2.img /home/Data/DataDisk/DataMount2;

:b
# -  - #
# - Change permissions to folder - #
sudo chmod 777 DataMount2

:c
# -  - #
# - Show mounting points - #
df -h DataDisk*;
df -H DataDisk*;
lsblk;

:d
# -  - #
# - Unmount partition - #
sudo umount /home/Data/DataDisk/DataMount2;



:G
# -  - #
# - Permanent mounting on fstab - #
# - Mount file image(partition) onto mounting folder - #

:a
# -  - #
# - .img files ext4 - #

/home/Data/DataDisk/DataDisk2.img /home/Data/DataDisk/DataMount2 auto defaults 0 0

/media/disk/image.img    /mnt/img         auto         defaults               0    0
/path/to.img             /mount/point     ext4         loop,offset=70254592   2    0 

:b
# -  - #
# - .iso files - #
/images/some_cd.iso      /mount/mounted   udf,iso9660  user,loop              0    0







# - eof - #