On Thursday, 25 September 2025 14:41:48 British Summer Time Dr Rainer Woitok wrote: > Michael, > > On Tuesday, 2025-09-23 16:46:48 +0100, you wrote: > > ... > > I've never used unetbootin, but if it just burns an ISO file on a USB > > device, then dd which I use frequently should achieve the same, e.g.: > > > > dd if=my_ISO_file of=/dev/sdc bs=1M conv=fsync status=progress > > > > where /dev/sdc is the USB device. > > Neither partitioning nor formatting of the USB stick is required? So > the bare minimum (without checksum checking) would be a two lines Shell > script running "wget" and "dd" to update the bootable image on my reco- > very USB stick? > > Sincerely, > Rainer
The ISO image contains its own partitions and fs format(s) as required. For example, this is the Gentoo minimal ISO which I have downloaded and transferred onto a 1.00 GB USB stick: ~ # gdisk -l /dev/sdb GPT fdisk (gdisk) version 1.0.10 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/sdb: 1953792 sectors, 954.0 MiB Model: USB DISK Pro Sector size (logical/physical): 512/512 bytes Disk identifier (GUID): FB0382CF-F338-4593-AC96-98E9954CE3F8 Partition table holds up to 176 entries Main partition table begins at sector 2 and ends at sector 45 First usable sector is 46, last usable sector is 1953746 Partitions will be aligned on 4-sector boundaries Total free space is 438937 sectors (214.3 MiB) Number Start (sector) End (sector) Size Code Name 1 64 563 250.0 KiB 0700 Gap0 2 564 6323 2.8 MiB EF00 EFI boot partition 3 6324 1514227 736.3 MiB AF00 HFSPLUS 4 1514228 1514827 300.0 KiB 0700 Gap1
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