====== Create Large (4GB > x > 20 MB) Mac CHDs ======


This is the second part of several mac related tutorials. The first part can be found [[howto:install_mac_system_6|here (Install Macintosh System 6)]] and [[howto:install_mac_os_7|here (Install Mac OS 7.5.3)]] is the third part.

Please note that you no longer have to do this part yourself! You can simply download pre-made blank formatted CHD images [[http://rbelmont.mameworld.info/?p=605|here]] from Arbee's site.

===== Prerequisites =====


You will need some file prior to get into this tutorial

==== Working installation of Mess ====

Minimum Recommended Version is Revision 9050 (Some revisions after the 0139u2 milestone)

==== Working installation of System 6 ====

Go to [[howto:install_mac_system_6|this page]] for more information

==== Original Apple HD SC Setup ====

Since the patched one fail at Initializing really big HDs, you must have the original Apple Tool found on the 2nd installation floppy of System 6 (see [[howto:install_mac_system_6|here]] for the detailed instructions)

==== Patched HD SC Setup ====

You need a patched version of the "Apple HD SC" tool since the original one will not work with bigger hard drives. You can get it here :

  * [[https://www.macintoshrepository.org/1107-apple-hd-sc-setup-7-3-5-patch|Macintosh Repository - Apple HD SC Setup 7.3.5 patched]]
  * Get the "apple_hd_sc_setup.p.sit" version and uncompress it. Don't forget to "un-sea" it
you can use [[http://code.google.com/p/theunarchiver/downloads/list|"The Unarchiver"]] which is a tool for Mac and PC (as a beta under the name "unar") to perform SEA Decompression.

==== BasiliskII Mac Emulator (Recommended) or HFSExplorer ====


At one point in this tutorial, you will have to copy a file from your real computer to an image. To this end I use BasiliskII since it got a handy "sharing" function. Yet, you will need a working installation of BasiliskII with a functional OS in it.

HFVExplorer seems to be an alternative for getting things done, yet I can't test this method right now. Feel free to expand this part if you can.

==== How-to ====

  * Convert the chd into suitable Basilisk drive image :
''chdman extracthd -i macsehd.chd -o macsehd.dmg''

  * In Basilisk now, mount the macsehd.dmg and use the native sharing function to copy "HD SC Setup 7.3.5 (Patched)"
  * Convert back the Basilisk image to use it for MESS :
''chdman createhd -c none -i macsehd.dmg -o macsehd.chd''

Now You'll be able to format bigger drive images directly from your Mac SE.

First you need to create a new CHD using chdman.
You have to use the right parameter for chdman how many Cylinders, Heads and Sectors you want. You can use [[http://www.csgnetwork.com/mediasizecalc.html|this tool]] to figure out.

Note that depending on which OS you want to run, there is volume limitations. For instance, after System 6 and before System 7.5 the limitation is 2GB. Starting with 7.5 the limitation is raised up to 4GB.

You can use System 6 with >2GB HDs as long as you only format the drive on it, and don't actually use it. See [[http://support.apple.com/kb/TA28860|here]] and [[http://support.apple.com/kb/TA27115|there]] for more about HDs limitations under Mac OS.

IE : ''chdman createhd -c none -chs 8000,16,64 -o newmachd4gb.chd''
The result will be a 4GB Hard Drive image. Some another examples :

''-chs 1400,16,64'' : for a 700MB Hard Drive image

''-chs 4000,16,64'' : for a 2GB Hard Drive image

''-chs 8000,16,64'' : for a 4GB Hard Drive image (OS 7.5 only. see above)



  * Run MESS (or MESS64) with both drive images :
''mess macse -hard1 macsehd.dmg -hard2 newmachd4gb.chd -ramsize 4M''

  * Start "Apple HD SC Setup" (Not the patched one), keep pushing "Switch Disk" Until it reads "The disk is uninitialized …"
  * Click on "Initialize", then on "Init"
If you have a fast forward key, just go for it

Wait …

  * Finally, name it like you want (MacHD4GB for me) and "Quit"
Last step is to make the whole disk enabled (at this time only some MB are usable)

  * Launch "HD SC Setup 7.3.5 (Patched)", Keep pushing "Switch Disk" Until you get your new HD
  * Click "Update" then "Continue"
  * Click "Partition" then go "Custom"
  * Select your MacHD4GB partition and "Remove" it, "OK".
  * Click somewhere in the gray box under "Mac Driver", select "Macintosh Volume" then put the Maximum value into the box, then "OK"
  * "Quit" the application.
  * Turn off the mac (use the "Special" menu) and quit MESS.

**You have now a valid CHD suitable for MESS, and that can be exported for use in Basilisk ([[howto:convert_chd_basilisk|Here for more about that]]).**

**[[http://rbelmont.mameworld.info/?p=605|Here’s]] a set of already formatted and partitioned blank Mac hard disk images (.CHD). Big thanks goes to Grégoire Duval and Arbee.**