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Re: bootable pendrive from zip file

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On 23/04/2024 13:21, Thomas Schmitt wrote:
> 
> Max Nikulin wrote:
>> Out of curiosity, does the requirement of specific GUID exist for removable
>> drives?
> 
> It is disputed, whether the specs say that the partitions must be marked
> by 0xEF in legacy MBR tables and by C12A7328-F81F-11D2-BA4B-00A0C93EC93B
> in GPT.

It happened so that I had locally a file with UEFI spec Version 2.3.1, 
Errata C June 27, 2012. I tried to search it for "removable" and for 
"0xef". Since I am not familiar with context of the following snippets, 
my interpretation may be wrong. Later versions may have some updates.

12.3.3 Number and Location of System Partitions
... Further, UEFI implementations may allow the use of conforming FAT 
partitions which do not use the ESP GUID. Partition creators may prevent 
UEFI firmware from examining and using a specific partition by setting 
bit 1 of the Partition Attributes (see 5.3.3) which will exclude the 
partition as a potential ESP.

 From my point of view it is opposed to "must be" for strict partition 
type checks.

I have noticed that FAT12 and FAT16 are allowed for removable media. The 
restriction is that while a fixed media may have multiple ESP, a 
removable one must have single EFI partition.

>> A USB drive may be formatted without partition table.
> 
> The specs only talk of partitions.

12.3.1 System Partition
... For a diskette (floppy) drive, a partition is defined to be the 
entire media.

Some details are in 12.3.4.2 Diskette

USB pen drive is not a diskette, but it increases probability that 
superfloppy formatting style is supported. Of course, singe FAT 
partition is more portable.

>> 7z and bsdtar can extract content of ISO files without mounting images.
> 
> But mounting needs no special software and gives you the opportunity
> to use many different ways of copying, which may be decisive when the
> target is a heavily restricted filesystem like FAT.

I usually have p7zip-full installed to be able to extract files from 
various archives, so I do not consider it as a too special. I did not 
need extra flexibility, with 7z there was no need for extra mount/umount 
commands, just extracting as a regular user was enough. So in some cases 
it is more convenient.

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Thread

bootable pendrive from zip file Luis Muñoz Fuente <luis.munoz.edu@juntadeandalucia.es> - 2024-04-22 19:00 +0200
  Re: bootable pendrive from zip file "Thomas Schmitt" <scdbackup@gmx.net> - 2024-04-22 20:00 +0200
    Re: bootable pendrive from zip file Luis Muñoz Fuente <luis.munoz.edu@juntadeandalucia.es> - 2024-04-22 20:10 +0200
      Re: bootable pendrive from zip file "Thomas Schmitt" <scdbackup@gmx.net> - 2024-04-22 20:30 +0200
        Re: bootable pendrive from zip file Luis Muñoz Fuente <luis.munoz.edu@juntadeandalucia.es> - 2024-04-22 21:00 +0200
        Re: bootable pendrive from zip file Luis Muñoz Fuente <luis.munoz.edu@juntadeandalucia.es> - 2024-04-22 21:10 +0200
          Re: bootable pendrive from zip file "Thomas Schmitt" <scdbackup@gmx.net> - 2024-04-22 21:50 +0200
    Re: bootable pendrive from zip file Max Nikulin <manikulin@gmail.com> - 2024-04-23 04:50 +0200
      Re: bootable pendrive from zip file "Thomas Schmitt" <scdbackup@gmx.net> - 2024-04-23 08:30 +0200
        Re: bootable pendrive from zip file Luis Muñoz Fuente <luis.munoz.edu@juntadeandalucia.es> - 2024-04-24 10:50 +0200
        Re: bootable pendrive from zip file Max Nikulin <manikulin@gmail.com> - 2024-04-25 05:30 +0200
          Re: bootable pendrive from zip file "Thomas Schmitt" <scdbackup@gmx.net> - 2024-04-25 09:00 +0200
            Re: bootable pendrive from zip file Max Nikulin <manikulin@gmail.com> - 2024-04-25 13:20 +0200
              Re: bootable pendrive from zip file "Thomas Schmitt" <scdbackup@gmx.net> - 2024-04-25 13:50 +0200

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