[Bug 811485] Re: EFI SYSTEM PARTITION should be atleast 100 MiB size and formatted as FAT32, not FAT16

[Launchpad Bug Tracker]

This bug was fixed in the package partman-efi - 24ubuntu3

---------------
partman-efi (24ubuntu3) precise; urgency=low

  * On x86 architectures, create EFI system partitions using FAT32 rather
    than FAT16, and require newly-created ones to have a minimum size of
    34091008 bytes, experimentally verified as the minimum libparted will
    accept (LP: #811485).
  * Never format EFI system partitions that already contain a filesystem
    (LP: #769669).
 -- Colin Watson <cjwatson at ubuntu.com>   Wed, 14 Mar 2012 14:31:13 +0000

** Changed in: partman-efi (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/811485

Title:
  EFI SYSTEM PARTITION should be atleast 100 MiB size and formatted as
  FAT32, not FAT16

Status in “partman-auto” package in Ubuntu:
  Fix Released
Status in “partman-efi” package in Ubuntu:
  Fix Released

Bug description:
  Create a EFI SYSTEM PARTITION of minimum 100 MiB size (200 MiB
  recomended). Also partman-efi should use FAT32 instead of FAT16 for
  EFI SYSTEM PARTITION as mandated by the UEFI 2.3.1 Spec. FAT16 ESP
  partition is not recognised by Windows 7 UEFI bootloader because of
  this.

  The below quote is copied form the UEFI Specification 2.3.1 - Chapter
  12.3 File System Format.

  [QUOTE]
  EFI encompasses the use of FAT32 for a system partition, and FAT12 or FAT16 for removable media. The FAT32 system partition is identified by an OSType value other than that used to identify previous versions of FAT. This unique partition type distinguishes an EFI defined file system from a normal FAT file system. The file system supported by EFI includes support for long file names.

  FAT defines that all files in a directory must have a unique name, and
  unique is defined as a case insensitive match.

  UEFI does not impose a restriction on the number or location of System Partitions that can exist on a system. System Partitions are discovered when required by UEFI firmware by examining the partition GUID and verifying that the contents of the partition conform to the FAT file system as defined in Section 12.3.1.1. 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.
  [/QUOTE]

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