Bug#475903: creates GPT when disk is > 2 TB rather than > 2 TiB

[Robert Millan <rmh@aybabtu.com>]

Package: debian-installer
Severity: normal

Partman opts for GPT when installing on a disk larger than 2 TB (2 * 10^12 B),
even though the limit for DOS partition map is 2 TiB (2^32 * 512 B).

This can be easily reproduced with qemu:

  qemu-img create -f qcow test.img 2047G

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.18-6-amd64 (SMP w/2 CPU cores)
Locale: LANG=ca_AD.UTF-8, LC_CTYPE=ca_AD.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash