A small memory dump file records the smallest set of useful information that may help identify why your computer has stopped unexpectedly. This option requires a paging file of at least 2 megabytes (MB) on the boot volume. On computers that are running Microsoft Windows 2000 or later, Windows create a new file every time your computer stops unexpectedly. A history of these files is stored in a folder.

This dump file type includes the following information:
The Stop message and its parameters and other data
A list of loaded drivers
The processor context (PRCB) for the processor that stopped
The process information and kernel context (EPROCESS) for the process that stopped
The process information and kernel context (ETHREAD) for the thread that stopped
The Kernel-mode call stack for the thread that stopped.

KB315263 describes how to examine a small memory dump file.

WhoCrashed may make things easier for you!

KB156280 tells you how to use Dumpchk.exe to check a memory dump file.