Flashing the drive manually for Jetson AGX Orin module

I was going through the link to flash manually for booting.
The following comand was mentioned in the link.

$ sudo ./tools/kernel_flash/l4t_initrd_flash.sh [ -S ] -c --external-device sda1 --direct external

In this command there are two device names(sda1 and sdx). My understanding is that the device name sdx(say sdb or sdc) is the drive to flash manually, but what about sda1. Is it the host PC hard disc device name? the flashing will alter sda1 device also?


--external-device sda1

means this device is going to be recognized as /dev/sda1 on Jetson.

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