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== Description ==
A "System Deployment Image" (aka SDI) is a file format used primarily with [[Microsoft]] products to house an arbitrary disk image, including boot sector information. Some versions of [[Microsoft Windows]] allow for "RAM [[booting]]", which is essentially the ability to load a SDI file into memory and then boot from it. The SDI file format also lends itself to network booting using the [[Preboot Execution Environment]] (PXE).
The SDI file itself is partitioned into the following sections:
; Boot [[BLOB]] : This contains the actual boot program, STARTROM.COM. This is analogous to the boot sector of a hard disk.
; Load [[BLOB]] : This typically contains [[NTLDR]] and is launched by the boot BLOB.
; Part [[BLOB]] : This contains the actual boot runtime (i.e. the contents of the disk image including any OS files) and also includes the [[boot.ini]] (used by NTLDR) and ntdetect.com files which should be located within the root directory of the runtime. The size of the runtime cannot exceed 500 Mb. In addition to this requirement the runtime must also be capable of dealing with the fact that it is booting from a ramdisk. This implies that the runtime must include the "Windows [[RAM Disk]] Driver" component (specified within the boot.ini).
== Image Management ==
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