Create Bootable USB disk of CentOS 7 in Mac OS x

0 0
0 0
Read Time:2 Minute

To create USB bootable disk from centos 7 ISO file in MacOS we can follow the below simple steps.

Create the dmg image file using below command.

oel7-MacBook-Pro:~ admin$ hdiutil convert -format UDRW -o centos7.img /Users/admin/Downloads/CentOS-7-x86_64-DVD.iso
Reading Master Boot Record (MBR : 0)…
Reading CentOS 7 x86_64 (Apple_ISO : 1)…
Reading (Type EF : 2)…
Reading CentOS 7 x86_64 (Apple_ISO : 3)…
………………………………………………………………………………………………………………………………………………………………
Elapsed Time: 16.127s
Speed: 256.1Mbytes/sec
Savings: 0.0%
created: /Users/admin/centos7.img.dmg

List the created file

oel7-MacBook-Pro:~ admin$ ls -lthr centos7.img.dmg
-rw-r–r– 1 admin staff 4.0G Apr 22 14:17 centos7.img.dmg
oel7-MacBook-Pro:~ admin$

List the available local and USB disks.

oel7-MacBook-Pro:~ admin$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *251.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 250.1 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +249.8 GB disk1
Logical Volume on disk0s2
5FA6060B-8356-4848-9E01-EDDD5D017AD4
Unencrypted

/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *7.7 GB disk2
1: 0xEF 6.4 MB disk2s2

oel7-MacBook-Pro:~ admin$

Partition the USB disk by finding the right disk.

oel7-MacBook-Pro:~ admin$ diskutil partitionDisk /dev/disk2 1 “Free Space” “unused” “100%”
Started partitioning on disk2
Unmounting disk
[ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ]
Creating the partition map
Waiting for partitions to activate
Finished partitioning on disk2
/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *7.7 GB disk2
1: EFI EFI 209.7 MB disk2s1
oel7-MacBook-Pro:~ admin$

Use DD command from dmg file to create the bootable disk, this operation will take more than 30 min to 1 hour for 4 GB ISO file.
It may complete less than above mentioned time if we are using an USB 3.0 sticks.

oel7-MacBook-Pro:~ admin$ sudo dd if=centos7.img.dmg of=/dev/disk2 bs=1m
Password:
4130+1 records in
4130+1 records out
4330866688 bytes transferred in 3432.114984 secs (1261865 bytes/sec)
oel7-MacBook-Pro:~ admin$

Once done disk will be ejected automatically, If not we can use below command to eject the USB stick.

oel7-MacBook-Pro:~ admin$ diskutil eject /dev/disk2

Using default utilities in MacOS we can create a bootable disk without using any third party tools.

About Author

Babin Lonston

Overall 14+ Years of experience in the IT field, currently working as a Senior Linux administration with Virtualization & Cloud. Being numismatist for a long time.
Happy
0 0 %
Sad
0 0 %
Excited
0 0 %
Sleepy
0 0 %
Angry
0 0 %
Surprise
0 0 %

Leave a Comment

Subscribe To Our Newsletter

Join our mailing list to receive the latest news and updates from our team.

We promise not to spam you, and we don't usually send more than one email a week.

You have Successfully Subscribed!

Exit mobile version