Apple Service Diagnostics (ASD) is distributed to Apple Service Providers. The Apple Service Diagnostics application is designed to run both EFI and Mac OS X tests from an external USB hard drive. Apple Service Diagnostics (EFI) runs low-level tests of the hardware directly and does not require Mac OS X, while Apple Service Diagnostics (OS) uses Mac OS X to run tests.Description :Installing Apple Service Diagnostics on a USB hard drive.
Please refer to the document "Installing ASD on a USB hard drive" included with this release.
Booting and using the Apple Service Diagnostics application.
! Before using Apple Service Diagnostics, disconnect any Ethernet network, USB, and audio cables!

Changes to ASD 3S135
EFI user interface has been changed to better match the OS user interface. Those changes are listed in ASD User Guide.
Added support for new Macintosh releases listed below.
ASD 3S135 supports the following machines
MacBook (13-inch, Late 2009)
iMac (21.5-inch, Late 2009)
iMac (27-inch, Late 2009)
Mac mini (Late 2009)

Ext. Information : Full translation of the description deliberately did not, who knows what it is - understands and who does not understand that IMHO it is absolutely not necessary.
In a nutshell, are as follows: The most recent diagnostic drive Apple.
This version add support for new models of Mack:
MacBook (13-inch, Late 2009)
iMac (21.5-inch, Late 2009)
iMac (27-inch, Late 2009)
Mac mini (Late 2009)