How to remove previous version of centos7 and install fresh centos7 in Toshiba Satellite using bootable USB

Question

My centos 7 has been corrupted. I want to install fresh centos7. When I run rpm -q kernel . It gives the following results

kernel-3.10.0-123.el7.x86_64
kernel-3.10.0-123.20.1.el7.x86_64
kernel-3.10.0-229.1.2.el7.x86_64
kernel-3.10.0-229.4.2.el7.x86_64

I try to install from the boot-able pendrive and change the boot order starting from USB. But It is giving Message remove removable device and press any key to start.

Please tell me how to install fresh centos 7 from USB and remove previous centos.

Answer 1

rpm -q = query and its output is a result search.

for bootable disk, follow it:

1.Plug in your USB device to your Linux computer's USB port. 2. Verify the device path of your USB storage with dmesg. 3. Proceed to (carefully!) image the ISO file on the USB device:

dd if=yourimage.iso of=/dev/sdb bs=512k

=)

I hope have helped you!! Sorry a little english