Editing BDemu Drive Format





== What is BDemu? ==
BDemu stands for Blueray Emulation, and is used by devs and official game-testers to load games (via a tool called PS3gen, which is official Sony software).
BDemu can be used on Debug/DEX consoles.


== Format an external HDD to BDemu ==
{{warning|content=When formatted to BDemu, the entire usb-drive is formatted, and the whole partition table will be lost!
The drive can however, at a later point be split up again to support multiple partitions. (see guide  under this text)
 }}

There are 2 methods to format a drive for BDemu:

# Format on a Debug/DEX ps3 (under Debug Settings) - (Recommended)
# Format using Ps3Gen 


It is recommended to format an external HDD on the PS3 (under debug settings) and '''NOT''' via ps3gen.
This is to ensure support for future BDemu modifications

'''Offset where BDemu begins on external-hdd:'''
<code>0000020000</code>

== How to split up ext. HDD to make it contain both BDemu and NTFS/FAT32 partitions. ==
[[File:Partizionemodificatawin.png|thumb|left|alt=Offset|The changed string at offset 0x01ca ]]
<pre>
* Format ext HDD on ps3 to BDemu, DON'T use ps3gen to do so!

* Connect the HDD to your PC;

* Start a HEX edit of your choice;

* In WinHEX, from the menu bar select “Tools -> Open Disk Drives”

* Now select the ext HDD that you just made BDemu

* Go to '''‘Offset “1CA”''', you can use the command ALT + G (with WinHEX)


1 sector = 512 bytes
Size my HDD = 500107862016 bytes
500107862016 : 512 = 976773168 sectors
Convert 976773168 into HEX = 3A386030
Reversed bytes 3A|38|60|30 -> 30|60|38|3A Maximum size of partition 2TB

*. Now using the above procedure we can choose the size that we want to give our PS3 partition.
Example(these exact value's work on any drive that is larger than 300GB, as it allocates precisely 300GB for BDemu on the drive):
My HDD is 500GB and I want to dedicate the 300GB PS3, so I will do so
a. Size that I want to give to the partition = 300GB -> 322122547200 bytes
b. Transform the bytes into sectors 322122547200 : 512 = 629145600 sectors
c. Convert sectors into HEX 629145600 -> 25800000
d. Reversed bytes 25|80|00|00 -> 00|00|80|25
e. Finally, I replace it and save the changes.

* Now open a partition manager/tool to allocate a NTFS or FAT32 partition on the left-over free space.

WARNING: Do not use BDemu game selecting on MultiMan, since doing that would render your custom partition
 table useless, i can confirm this myself - (MARA).
However you can recover, if you set the string back to the value u use beforehand in winhex(to allocate size), and use a partition recovery software to recover the ntfs and fat32 partitions.

* Done!

</pre>

== How to add and resize slots on a BDemu partition manually ==
(use Aldo's tool on the bottom of this page for an automated solution)
<pre>
By default when you format your external drive to BDEMU on ps3 console it'll make 46GB sized partitions same goes with ps3gen BDEMU format utility except ps3gen will you give you 4 slots for games, problem is you can only have 4 and if your external isn't at least 184GB+ you can't use all partitions.

For instance since I am using a 32GB sandisk thumb drive i would only get one partition each time, meaning only one game. Because each partition has to take up 46GB (Bluray dual layer basically) it doesnt take your drive size like mine 32GB and divide by 4 slots meaning I should have four 10.6GB slots but it doesnt work that way.

So i found another way that works requires a hex editor. I'll use HxD for this tutorial or whatever you want to call it. I also used aldostools start_ps3gen.exe to have any # of slots I wanted up to 255 instead of just 1 or 4. (you can also edit the ps3gen dll to do this)

SETUP
1. Put start_ps3gen.exe in same folder as ps3gen (check both to run as admin)
2. Open start_ps3gen.exe pick number of slots you want.
3. ps3gen should start after you do this, pick command then BD Emulator HDD Utility...
(May have to format first on PS3 if run into problems)
4. pick your drive then pick Format HDD for BD emulator, say yes to all warnings.
5. this should make the # of slots you picked in step 2 into images on disc.
6. Now build a game in ps3 gen (find out how to do this yourself)
7. at the end of building game where you the select output image format pops pick For BD Emulator (direct) and choose Image0
8. Game will write to ext HD (takes about an hour for a 20gb game)

RESIZING
(Since you'll be fooling with your hard drive in this section, make sure you fully understand this guide to do this, it works ive tested, i take no responsibility for possible damage)
9. Open Hxd (or other hex editor like winhex) go to Extras, open disk and pick your external disk with ps3 game and uncheck read only

10. Press ctl+g or pick search, Go to..., type in offset 20000

11. If you're in the right place to the right of the hex you should be able to read BD-EMU-1

12. At offset 20034 starts your first slot partition size 46GB hex 05D3A0

13. to the right of hex 05D3A0 there are some zeros then more hex this is the ACTUAL size of the game you just put on there

14. Open up calculator in windows, pick view, programmer take the ACTUAL SIZE OF GAME in hex and multiply by 4
example: my Resident evil 6 was 513F40 (10.1GB) multiply by 4 is 144FD00

15. Take this new hex value (ACTUAL GAME SIZE multiplied by 4 in hex value ex: 144FD00 for my RE6) and replace the 46GB hex number with it so 05D3A0 (46GB partition size) becomes ACTUAL GAME SIZE multiplied by 4 hex value (Example: 144FD00 hex value)

16. As you may notice every other line there is pattern, each time you see 05D3A0 thats the next partition. Since I picked 3 slots I see this 05D3A0 3 times.

17.Pick file, save in HxD close program.

18. Add another game to Image1 (the next partition) via ps3gen and start from step 9, do this for each new game added
</pre>



== BDemu Drive Tools == 
* Aldo's BdEmuPartitionTool --> http://www.aldostools.org/temp/BdEmuPartitionTool.exe
* Freeplay's Open BDemu-HDD Manager (source included) http://www.mediafire.com/?19hc4dtz5j4d8e9

== Sources: ==
http://www.ps3hax.net/2012/10/guide-how-to-edit-the-size-of-slot-and-hdds-partition-in-ps3gen/

http://psx-scene.com/forums/f290/tutorial-bdemu-change-size-partitions-match-game-rather-than-46gb-default-dex-106748/