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+0.6.8 (5/23/2010):
+------------------
+
+- Added tests to see if the file to be opened is a directory,
+  character device, FIFO, or socket; program now terminates if any of
+  these conditions is met. (Linux/FreeBSD/OS X only.) Thanks to an
+  anonymous contributor for this patch.
+
+- Added 'f' option on gdisk's experts' menu (-G/--randomize-guids in
+  sgdisk). This option randomizes the disk's GUID and all partitions'
+  GUIDs. Intended for use after cloning a disk with a utility that copies
+  the GUIDs intact (such as a raw dd copy) if you want each disk copy to
+  have its own set of GUIDs.
+
+- Added -u/--partition-guid and -U/--disk-guid options to sgdisk. These are
+  the equivalents of the 'g' and 'c' options, respectively, on the gdisk
+  experts' menu: They enable adjusting an individual partition's GUID or a
+  disk's GUID. The GUID may be either a fully specified GUID value or 'R'
+  or 'r' to set a random GUID value.
+
+- Fixed compile problem for FreeBSD (its math library lacks a log2()
+  function). Also created separate Makefile.freebsd with a couple of
+  FreeBSD-specific options.
+
+- Added -N (--largest-new) command to sgdisk. This command creates a single
+  partition that fills the largest single unpartitioned block of space on
+  the disk.
+
+- Fixed sgdisk man page error: the --change-name option was incorrectly
+  listed as --change.
+
+- Added 'h' option to gdisk experts' menu (-C or --recompute-chs in sgdisk)
+  to recompute all protective/hybrid MBR CHS values. This option is
+  intended to work around a bug in at least one BIOS that prevents the
+  computer from booting when the GPT-mandated (but technically illegal)
+  0xFFFFFF CHS value is used as the end point for a protective MBR. The
+  recomputed values will be legal (e.g., 0xFEFFFF instead of 0xFFFFFF),
+  but incorrect in GPT terms, and will therefore enable at least one
+  BIOS to boot with a GPT disk. See http://www.rodsbooks.com/gdisk/bios.html
+  for all I know about BIOS/GPT incompatibilities.
+
+0.6.7 (5/1/2010):
+-----------------
+
+- Undid earlier change, with version 0.6.4, that wiped the MBR boot loader
+  when doing MBR-to-GPT conversions. I've now become skeptical that MBR
+  boot loaders were causing any real problems on GPT disks, so I'm going
+  back to the philosophy of leaving as much alone as possible.
+
+- Fixed bug that caused incorrect reporting of free space on 0-size disks
+  (e.g., files of 0 length passed as disk images).
+
+- Fixed bug that caused segfault on some invalid disks
+
+- Fixed bug that caused incorrect partition numbers to be displayed for
+  some verify problems.
+
+
+0.6.6 (3/21/2010):
+-----------------
+
+- Added support for the "no block IO protocol" (referred to as "hide from
+  EFI" in GPT fdisk) and "legacy BIOS bootable" attribute bits. See Table
+  19 of the UEFI 2.3 specification (p. 153) for details.
+
+- Changed the sequence in which GPT data structures are written to disk;
+  backups are now written first, followed by the main structures. This is
+  as recommended in the UEFI 2.3 specification, since it's safer in the
+  extremely unlikely event that a RAID array's size is increased and
+  there's a power outage mid-write. (If the main structures are written
+  first in this case, they'll point to data that's not yet been written;
+  but by writing the backups first, the old main structures will still
+  point to the valid old backup structures.)
+
+- Protective MBRs now have disk signatures of 0x00000000, to better
+  conform with GPT as described in the UEFI 2.3 specification.
+
+- Added alignment information to the summary data produced by the
+  'p' main-menu option in gdisk or the -p option to sgdisk.
+
+- More alignment changes: GPT fdisk now attempts to determine the alignment
+  value based on alignment of current partitions, if any are defined. If no
+  partitions are defined, a default value of 2048 is set. If the computed
+  value is less than 8 on drives over about 596GiB, it's reset to 8, since
+  the drive might be a WD Advanced Format unit that requires an 8-sector
+  (or larger power-of-2) alignment value for best performance. The
+  2048-sector default provides better alignment in some RAID
+  configurations.
+
+- Changed behavior when a backup restore fails. Previously, GPT fdisk
+  would create a fresh blank set of partitions. Now it does so only
+  if the failure occurs when interpreting the backup's contents; if the
+  user typed the wrong filename, the in-memory data structures aren't
+  touched.
+
+
+0.6.5 (3/7/2010):
+-----------------
+
+- Added tests to verify ('v') function and to pre-save checks to look for
+  partitions that end before they begin or that are too big for their
+  disks.
+
+- Fixed a bug that could cause spurious data to appear in a grown partition
+  table.
+
+- Added ability to convert some or all partitions to logical partitions in
+  GPT-to-MBR conversion. This feature is limited by the fact that at least
+  one free sector must exist immediately prior to each logical partition,
+  so it won't do much good if partitions are crammed together. It should be
+  possible to convert back to MBR any disk that started that way, provided
+  no partitions were added or resized when the disk was in GPT form; and
+  disks that were partitioned with Apple's Disk Utility or other tools that
+  insert unpartitioned space should also be convertible. CAUTION: THE
+  LOGICAL PARTITION CREATION FEATURE DOESN'T TRY TO ALIGN PARTITIONS OR
+  PARTITION HEADER DATA TO CYLINDER BOUNDARIES! It's conceivable that some
+  older OSes or utilities will object to these disks, although Linux, OS X,
+  Windows Vista, and Windows 7 all seem happy with them.
+
+- Fixed bug that caused creation of 0-length file if an incorrect device
+  filename was typed.
+
+- The gdisk program now prompts for a device filename if it's called with
+  no options. This enables gdisk to do something useful if it's launched by
+  double-clicking its icon in a GUI environment.
+
+- Added workaround for bug in some versions of MinGW that caused the
+  program to garble input sector numbers.
+
+- The Windows version now works on disks with over-512-byte sectors.
+  Tested on a magneto-optical (MO) drive with 2048-byte sectors.
+
+- Added -D (--display-alignment) option to sgdisk, to display sector
+  alignment value (by default, 1 for sub-800GiB disks and 8 for disks
+  over that size).
+
+- Fixed bug in computation of CHS geometries for protective MBR. This is
+  non-critical, since most modern utilities ignore the CHS geometries.
+  Concerned users can use the 'n' option on the experts' menu to build new
+  protective MBRs with the new algorithm, if desired. (Note that GNU
+  Parted, at least, gets this wrong, too.)
+
+- Fixed memory-allocation bug when reading GPT disks with partition tables
+  with over 128 entries; could cause program to crash on startup.
+
+0.6.4-2 (2/20/2010):
+--------------------
+
+Note: Neither of the following changes affects actual program code, so I've
+left the version number in the program at 0.6.4.
+
+- Altered Makefile to pass user's compiler and linker environment
+  variables through.
+
+- Added #include to gpttext.cc to enable it to compile on the latest
+  GCC versions (it was failing on at least some 4.4.x compilers).
+
+0.6.4 (2/19/2010):
+-------------------
+
+- Added -m (--gpttombr) option to sgdisk, enabling conversion of GPT
+  disks to MBR format, with a limit of four partitions total, and of course
+  without overcoming the 2TiB limit.
+
+- Added -h (--hybrid) option to sgdisk, enabling creation of hybrid
+  MBRs. Fewer options are available in sgdisk than in gdisk, though,
+  in order to keep the user interface manageable.
+
+- Fixed off-by-one bug in specification of partition when using the
+  -T (--transform-bsd) option in sgdisk.
+
+- Changed the code to create a new MBR unique disk signature whenever a new
+  protective MBR is generated (when doing an MBR-to-GPT conversion, when
+  using the 'n' option on the experts' menu, or when using the 'o' option
+  on the main menu, for example). Previous versions attempted to preserve
+  the existing MBR disk signature in most cases, but this resulted in
+  values of 0x00000000 whenever an empty disk was partitioned, and often in
+  other cases, too. Better to risk changing this value too often than to
+  leave multiple disks with 0x00000000 values, I think.
+
+- Added transpose ('t' on experts' menu in gdisk; or -r or --transpose in
+  sgdisk) command to enable fine-tuning partition order without doing a
+  full sort.
+
+- Added code to clear the MBR boot loader when doing an MBR-to-GPT
+  conversion. (This was already done in full-disk BSD-to-GPT conversions.)
+  This is done because I've seen a few problem reports that make me think
+  some MBR boot loaders freak out and hang the system when they encounter
+  GPT disks, and/or they attempt to load a second-stage boot loader stored
+  in what is now GPT territory, causing a system hang. Since MBR boot
+  loaders don't work on GPT disks anyhow (even GRUB needs to be
+  reinstalled), this new wiping behavior shouldn't cause any problems, and
+  may prevent a few.
+
+- Fixed bug in Windows version that prevented saving backup files.
+
+- Fixed bug that caused second and subsequent partition numbers in
+  prompts in hybrid MBR conversion procedure to be displayed in
+  hexadecimal.
+
+- Fixed very obscure potential bug in hybrid MBR/GPT synchronization when
+  deleting partitions; code wasn't matching partition lengths correctly,
+  which would only affect partitions that start at the same point but have
+  different lengths in MBR vs. GPT.
+
+- Fixed bug in the -E option to sgdisk; it was actually returning the
+  last free sector, not the last free sector in the largest free block.
+
+- Fixed bug in -t option to sgdisk; it was corrupting partition type
+  codes.
+
+- Fixed minor alignment bug in partition summary list ('p' from any menu)
+  when partition sizes are between 1000 and 1024 units.
+
+- Backup restore function ('l' on recovery & transformation menu) now
+  accepts both backups generated by GPT fdisk and backups created by a
+  direct copy (via dd, etc.) of the MBR, main GPT header, and main GPT
+  partition table, in that order. ("dd if=/dev/sda of=backup.gpt bs=512
+  count=34" will do this on Linux for a disk with a typical-sized GPT table
+  of 128 entries.)
+
+0.6.3 (2/3/2010):
+------------------
+
+- Fixed serious data corruption bug on big-endian (PowerPC and similar)
+  systems.
+
+- Changed several GPT fdisk Solaris type codes to correct a duplicate
+
+- Corrected error in GPT fdisk type codes for NetBSD LFS and NetBSD RAID;
+  they were identical, but I've now changed NetBSD RAID to A906, which
+  is unique.
+
+- Added GUID for IBM General Parallel File System (GPFS) partition type
+  code. Somewhat arbitrarily set it to use the 7501 number (MBR code 0x75
+  is used by IBM PC/IX, so it's at least the right company, by my loose
+  numbering rules....).
+
+- Improved GUID generation. Prior versions generated completely random
+  numbers for GUIDs. This works, but is technically a violation of the
+  spec. Unix versions now employ libuuid to generate GUIDs in a more
+  correct way. The Windows version still generates random numbers, though.
+
+- Turned PartTypes class into a derived class of GUIDData, and renamed
+  it to PartType.
+
+- Created new GUIDData class, to replace the original GUIDData struct.
+
+0.6.2 (1/29/2010):
+------------------
+
+- The change-type ('t' on main menu) option now changes the partition's
+  name *IF* the current name is the generic one for the partition type.
+  If the current name is not the generic name, it is NOT changed.
+
+- Fixed bug that caused new protective MBR to not be created when the
+  MBR was invalid and the GPT was damaged and the user opts to try to
+  use the GPT data.
+
+- Enabled default partition type code of 0700 when creating partitions
+  or changing their type codes. (Type 0700, Linux/Windows data, is set if
+  the user hits the Enter key alone.)
+
+- Fixed bug in sort ('s' on main menu) option that caused partition
+  numbers to begin at more than 1 if the original partition list had
+  too many empty partitions before the last one defined.
+
+- Improved code to determine which partition table to load in case of
+  CRC mismatches between the partition tables and the stored CRC values
+  in the headers.
+
+- Compiles using MinGW (http://www.mingw.org) to create a Windows binary.
+
+- Moved all disk I/O functions to the new DiskIO class. This helps with the
+  Windows port; it uses diskio-windows.cc for Windows-specific code,
+  diskio-unix.cc for the Linux, FreeBSD, and OS X code, and diskio.cc for
+  cross-platform disk I/O code.
+
+- Changed BSD disklabel detection code to be more correct (I think).
+  This change has no effect on my test disks, but I hope it'll work
+  better on disks with sector sizes other than 512 or 2048.
+
+0.6.1 (1/20/2010):
+------------------
+
+- Fixed bug that returned incorrect disk size on 32-bit versions of
+  FreeBSD.
+
+- Fixed bug that prevented FreeBSD version from working on disk image
+  files.
+
+- Fixed bug that caused BSD disklabel conversion to fail.
+
+0.6.0 (1/15/2010):
+------------------
+
+- Fixed bug that caused the convert to MBR function to fail.
+
+- Added support for disks with other than 512-byte sectors.
+
+- Created embryonic sgdisk program.
+
+- Fixed bug that caused relative sector numbers entered by users (e.g,
+  "+128M") to be misinterpreted as from the start of the range rather than
+  from the default value.
+
+0.5.3 (1/4/2010):
+-----------------
+
+- Fixed bug in display of GUIDs when compiled with some versions of GCC.
+
+- Eliminated warnings caused by additional checks in latest versions of
+  GCC. These warnings were harmless, but to eliminate them I've added
+  more error checking on disk I/O.
+
+- Eliminated unnecessary warnings about potential data loss if the program
+  was launched with the -l option or if writes aren't possible.
+
+- Added code to set the partition boundary value based on the physical
+  sector size. (FindAlignment() function.) This function, however, works
+  only on Linux, and then only if the BLKPBSZGET ioctl is defined. This
+  ioctl is new in kernel 2.6.32 or thereabouts.
+
+0.5.2 (12/31/2009):
+-------------------
+
+- Modified partition creation function to begin partitions on 8-sector
+  boundaries by default. This improves performance on the new Western
+  Digital Advanced Format drives. The new 'd' and 'l' options on the
+  experts' menu display and change, respectively, the boundary size.
+
+- Tweaked code to produce fewer warnings on the latest versions of
+  GCC.
+
+0.5.1:
+------
+
+- Made some minor edits to the man page.
+
+- Incorporated RPM .spec file changes contributed by Scott Collier
+  (boodle11@gmail.com).
+
+- Changed method of locating and loading backup GPT data, to use the
+  main header's pointer, if it's valid, rather than seeking to the
+  end of the disk.
+
+- Added 'e' option (relocate backup GPT data structures) to the experts'
+  menu.
+
+- Fixed bug that prevented recovery of partitions in case of partially
+  damaged GPT data (bad main and good backup or bad backup and good
+  main header, for instance).
+
+0.5.0:
+------
+
+- Added GPT-to-MBR conversion function. It's very limited, but potentially
+  useful in some cases.
+
+- Fixed bug that caused incorrect file sizes to be reported on 32-bit
+  Linux, thus causing problems when editing partition tables in disk images
+  or when loading GPT backup files.
+
+- Fixed bug that caused bogus CRC error reports when loading backup GPT
+  data.
+
+- Reorganized menus. There are now three: the main menu, the experts' menu,
+  and the recovery & transformation menu. The last of these has most of the
+  items that had been on the earlier versions' experts' menu.
+
+- Added ability to re-load the MBR and generate a fresh GPT from it. This
+  is normally identical to quitting and re-running the program, but it
+  could be handy if, say, the GPT partitions on a hybrid configuration are
+  badly messed up; this will enable using the hybridized partitions as the
+  starting point for a new GPT setup.
+
+- The program now generates CHS values for hybrid and GPT-to-MBR conversion
+  MBRs. For the moment, the assumption is the maximum number of heads and
+  sectors per track (255 and 63, respectively), although the bulk of the
+  code supports other values -- it'd just be awkward to enter the data in
+  the user interface.
+
+- Fixed minor display bug that caused number of sectors on the disk to be
+  shown as 0 on large disks when running 32-bit binaries.
+
+- Reverted 0.4.2's zap (destroy GPT) changes, since I don't want to wipe
+  out a valid MBR if the user created that MBR over an older GPT without
+  first properly wiping out the GPT, and the user now wants to wipe out
+  the GPT.
+
+- Reformatted and edited the man page. Aside from edits related to the
+  preceding program changes, I've altered the markup slightly and trimmed
+  much of the more tutorial information from the man page to better
+  conform to typical terse man page style.
+
+0.4.2:
+------
+
+- Code cleanup.
+
+- Fixed very small formatting bug in display of hex code when a match isn't
+  found when converting from an MBR/gdisk hex code to a GUID type code.
+
+- Added the ability to work on disk image files (raw files for virtual
+  machines, backup images, etc.). The program assumes that all such disk
+  image files have 512-byte sectors.
+
+- Added verification prompt to 'o' main-menu option to avoid accidental
+  erasures of all partitions.
+
+- The "destroy GPT data structures" option ('z' on the experts' menu) now
+  also destroys all EFI GPT (0xEE) partitions in the MBR.
+
+- Added an extra warning to the "destroy GPT data structures" option if an APM
+  or BSD disklabel was detected on the disk.
+
+- Added a buffer flush after destroying GPT data structures, to get the OS
+  to read the new (empty or MBR-only) partition table.
+
+- Fixed bug that allowed entry of nonexistent partition numbers when creating
+  a hybrid MBR.
+
+0.4.1:
+------
+
+- Code cleanup/re-organization
+
+- Partition creation function ('n' on main menu) now uses the start of the
+  largest available chunk of free space rather than the first available
+  sector as the default starting sector number. This should enable easier
+  partition creation if there are small bits of free space on the disk.
+
+- You can now specify the end point of a partition by using a minus sign,
+  in which case the end point is the default value minus the specified
+  size. For instance, "-200M" creates a partition that ends 200MiB before
+  the default end point.
+
+- You can now specify the start point of a partition by using a plus or
+  minus sign, in which case the start point is the specified distance from
+  the start (+) or end (-) of free space. This is exactly the same as the
+  new rules for entry of the end point, except that the default value is
+  set differently.
+
+- Deleting a partition now checks for a matching hybrid MBR partition, and
+  if one is found, it's deleted. Any empty space that then surrounds the
+  0xEE (EFI GPT) MBR partitions is then added to the nearby 0xEE partition.
+  If no non-0xEE partitions are left, a fresh protective MBR is generated.
+
+- Added hybrid MBR consistency check to the verify ('v') option and to
+  pre-write checks. If non-0xEE/non-0x00 MBR partitions without
+  corresponding GPT partitions are found, the user is warned. This finding
+  does NOT prevent writing the partition table, though.
+
+- Added non-destructive write test when opening the device file, in order
+  to detect the problem with FreeBSD being unable to write to disks with
+  mounted partitions (or other potential problems).
+
+0.4.0:
+------
+
+- Added support for BSD disklabels. The program can now convert disks that
+  use "raw" disklabels, with the caveat that the first partition will
+  almost certainly need to be deleted because it'll overlap the main GPT
+  header; and convert disklabels contained within a GPT (or a former MBR,
+  converted to GPT) partition. In the latter case, the 'b' main menu option
+  is used.
+
+- Added support for compiling on FreeBSD.
+
+- Fixed bug that could cause crashes or incomplete sorts when sorting
+  the partition table.
+
+- New partitions, including converted ones, now take on the name of the
+  partition type as a default name.
+
+- Reorganized some code; created a separate C++ class for GPT partitions
+  (GPTPart), which replaced a struct and enabled moving code from the
+  bloated GPTData class into GPTPart.
+
+- Fixed a bug that produced spurious warnings about unknown sector sizes
+  when loading a backup file.
+
+0.3.5:
+------
+
+Note: This version was not officially publicly released; I wanted to test
+the big-endian support while developing 0.4.0.
+
+- Tweaked the disk type identification code to warn users to re-sync their
+  hybrid MBRs when one is detected.
+
+- Tweaked MBR-reading code to ignore 0xEE (EFI GPT) partitions. This will
+  only have an effect on a poorly partitioned MBR disk that contains an
+  inappropriate EFI GPT partition, or when attempting to recover a
+  corrupted disk by using the hybrid MBR for data recovery.
+
+- Added big-endian (PowerPC, etc.) support!
+
+- Added code to identify and warn of the presence of an Apple Partition
+  Map (APM) on the disk.
+
+- Enabled MBR conversion code to handle multiple logical partitions.
+
+0.3.4:
+------
+
+- Fixed bug that enabled (possibly accidental) entry of MBR type codes of
+  0x00 in GPTData::MakeHybrid(). The fix also enables entry of default
+  type code by pressing the Enter key when prompted. Applied a similar
+  fix to the entry of the type code for the second protective partition,
+  if one is used.
+
+- Fixed a typo: "sectors" was spelled "sectprs" in one spot!
+
+- Fixed bug that caused default entry for end sector to be refused if an
+  initial value using a plus sign (e.g., "+20G") was also refused.
+
+0.3.3:
+------
+
+- Gave users control over the way MBR partitions are assigned to slots in a
+  hybrid MBR setup; the original method (putting the 0xEE partition after
+  the real partitions) works well for non-boot disks, but both GRUB and
+  GRUB2 become confused by this type of setup, so it needs changing.
+
+- Changed "blocks" to "sectors" in GPT and MBR table displays.
+
+- Added "Boot" column to MBR table display; shows an asterisk (*) when the
+  partition's status is bootable.
+
+0.3.2:
+------
+
+- Changed __DARWIN_UNIX03 to __APPLE__ as code to enable MacOS X support.
+
+- Added the ability to create a hybrid MBR ('h' on experts' menu). This was
+  motivated by my discovery that Windows 7 remains brain-dead when it comes
+  to the ability to boot from a GPT disk, at least on BIOS-based machines.
+
+- Added 'z' option to experts' menu, to destroy GPT data structures and
+  exit. The intent is to use this feature to enable subsequent partitioning
+  of the disk using fdisk or other GPT-unaware tools. (GNU Parted will wipe
+  the GPT data structures itself when you create a new MBR ["msdos
+  disklabel," in Parted parlance], so using Parted is another option.)
+
+- Slightly altered the effect of the 'o' command on the main menu. It now
+  blanks out the protective MBR, as well as the GPT data.
+
+0.3.1:
+------
+
+- Added Mac OS X support, provided as a patch by David Hubbard
+  (david.c.hubbard@gmail.com).
+
+- Fixed bug in disksize() function on Mac OS. (Possibly dependent on the
+  kernel and/or GCC version.) The disk size, of type uint64_t, was not
+  being passed correctly, so I reorganized the function to return it as
+  the function's return value rather than as a parameter. This seems to
+  work OK on my Mac OS test system and on both 32- and 64-bit Linux
+  systems.
+
+- Fixed off-by-one bug in GPTData::FindLastAvailable().
+
+- Fixed bug that caused display of options after a disk-write error.
+
+- Fixed several incorrect MacOS X partition type GUIDs, thanks to Yves
+  Blusseau (1otnwmz02@sneakemail.com).
+
+0.3.0:
+------
+
+- Changed version number to 0.3.0, reflecting the fact that I've received
+  no significant bug reports and so am elevating the program to "beta"
+  status. This change also entailed altering the warning the program
+  displays when saving partition table changes.
+
+- Fixed minor bug in CHS geometry of the protective MBR's type EE partition
+  (was producing 0x000200 as the start value, but should be 0x000100).
+  Should be a non-critical bug since the protective MBR partition
+  definition is only there to keep MBR-only disk utilities from messing
+  with the disk.
+
+- Added ability to enter GUIDs as single massive strings rather than in
+  chunks.
+
+0.2.2:
+------
+
+- Added #include directives required to compile the program using GCC
+  4.4.0.
+
+0.2.1:
+------
+
+- Fixed partition numbering problem in reports of partition overlaps in
+  verification function.
+
+- Fixed 1-sector partition size problem when creating new partitions
+  (partitions were 1 sector too big when using the +size option).
+
+- Changed BytesToSI() to display values in bytes without decimal points
+  (e.g., "512 bytes" rather than "512.0 bytes").
+
+- Added GPTData class member functions to retrieve GPT data structure
+  locations on disk; used in my internal-use-only GPT-wiping program.
+
+- Eliminated the "a reboot is recommended" notice after writing the
+  partition table.
+
+- Added notice after sorting the partition table to the effect that
+  editing /etc/fstab and/or the boot loader files may be required.
+
+- Fixed bug in MBR-reading function that caused 0x0f (Win95 LBA) and 0x85
+  (Linux extended) extended partitions to not be read.
+
+- Fixed bug in GetLastSector() (in support.cc) that would have prevented
+  correct user entry of over-32-bit sector numbers on 32-bit systems.
+
+- Made some changes/corrections to the partition type list in
+  parttypes.cc. Most of these were based on newly-discovered MBR type
+  codes for Apple (Mac OS X) filesystems.
+
+- General code cleanup (setting explicit casts, etc.)
+
+0.2.0:
+------
+
+- Initial semi-public release