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docs: add instructions to prepare a used OSdisk (#4218)

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ci/README.md
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@ -6,9 +6,10 @@
- [Ready made images](#ready-made-images)
- [Write the image to a disk connected with USB](#write-the-image-to-a-disk-connected-with-usb)
- [Prepare the disk](#prepare-the-disk)
- [Option 1 - requires less disk space](#option-1---requires-less-disk-space)
- [Write the .qcow2 file directly to disk with `qemu-image dd`](#write-the-qcow2-file-directly-to-disk-with-qemu-image-dd)
- [Option 2 - convert to a raq disk image first](#option-2---convert-to--a-raq-disk-image-first)
- [Option 2 - convert to a raw disk image first](#option-2---convert-to-a-raw-disk-image-first)
- [Convert the .qcow2 volume to a raw disk image](#convert-the-qcow2-volume-to-a-raw-disk-image)
- [Write the .img to the disk](#write-the-img-to-the-disk)
- [The first boot](#the-first-boot)
@ -46,15 +47,31 @@ https://github.com/rootzoll/raspiblitz/actions/workflows/amd64-lean-image.yml?qu
sudo apt install -y qemu-utils
```
## Write the image to a disk connected with USB
### Prepare the disk
* identify the connected disk with `lsblk` e.g., `/dev/sdk`
* set the disk variable
```
# identify the USB connected disk
lsblk
# set the disk variable
disk=/dev/sdk
```
* clean the existing partitions:
```
# unmount all partitions
sudo umount ${disk}*
# wipe the partition table
sudo wipefs --all ${disk}
```
### Option 1 - requires less disk space
#### Write the .qcow2 file directly to disk with `qemu-image dd`
* the .qcow2 volume is 8.1 GB
* identify the connected disk with `lsblk` e.g., `/dev/sdk`
```
disk="/dev/sdk"
sudo qemu-img dd if=./raspiblitz-amd64-debian-lean.qcow2 of=${disk} bs=4M
```
### Option 2 - convert to a raq disk image first
### Option 2 - convert to a raw disk image first
#### Convert the .qcow2 volume to a raw disk image
* the raw .img is 30GB
```
@ -66,7 +83,6 @@ https://github.com/rootzoll/raspiblitz/actions/workflows/amd64-lean-image.yml?qu
* use [Balena Etcher](https://www.balena.io/etcher/)
* or `dd` to write the .img to disk
```
disk="/dev/sdk"
sudo dd if=./raspiblitz-amd64-debian-lean.img of=${disk} bs=4M status=progress
```