Misplaced Pages

System Deployment Image

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages)
This article needs to be updated. Please help update this article to reflect recent events or newly available information. (September 2014)
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "System Deployment Image" – news · newspapers · books · scholar · JSTOR (August 2008) (Learn how and when to remove this message)
This article may be confusing or unclear to readers. Please help clarify the article. There might be a discussion about this on the talk page. (August 2008) (Learn how and when to remove this message)
(Learn how and when to remove this message)

A System Deployment Image (aka SDI) is a file format used primarily with Microsoft products to contain an arbitrary disk image, including boot sector information.

Description

The System Deployment Image (SDI) file format is often used to allow the use of a virtual disk for startup or booting. Some versions of Microsoft Windows allow for "RAM booting", which is essentially the ability to load an 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). Another usage is hard disk imaging. 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 Operating System 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).
Disk BLOB
This is flat HDD image starting with a MBR. It is used for hard drive imaging instead of booting. Also only Disk BLOBs can be mounted with Microsoft's utilities.

SDI usually contains either Disk BLOB (HD cloning or temporary SDI) or three other of them (bootable SDI).

Windows Vista or Windows PE 2.0 boot sequence includes a boot.sdi file, which contains Part BLOB for an empty NTFS volume and a Table-of-Contents slot for the WIM image, which is stored on a separate on-disk file.

SDI features

SDI driver

SDI files can be mounted as virtual disk drives and assigned a drive letter if an SDI driver is available to allow this. A SDI driver is a type of storage driver and is commonly used with Windows XP Embedded.

SDI management

Microsoft provides a tool called the "SDI File Manager" (sdimgr.exe) which can be used for the purpose of manipulating SDI files. Some of the tasks which this tool facilitates are:

  • The creation of an SDI image file.
  • The creation of an SDI image file from an existing hard disk partition.
  • The verification of an existing SDI image.

SDI loader

The mechanism which allows for the creation, addition and removal of virtual disk drives. SDI Loader and Driver work with Disk BLOB.

See also

References

Category: