Dell System ID Record (Type 255)

Source: reverse engineered from the dumps of the data corpus.

Holds the system ID of the platform in hexadecimal digits, e.g. 0A64 in dell/g15-5510.bin, which the revisions and IDs (type 208) and the OEM strings (type 11, key 1) hold too, along with an identifier, whose meaning is not established, beginning with _SID on all systems of the data corpus but OptiPlex 9030 AIO, which holds dellDelldellDELL.

Most structures are 8 bytes long, and hold 0 in their last two bytes, while the ones of G15 5510 and XPS 13 9300 are 6 bytes long. Most of the longer ones carry two more strings no field refers to: the identifier again, and DELL.

Table 1. Dell System ID Record structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`255`	Dell System ID Record indicator
`0x01`	2.0+	Length	`BYTE`	Varies	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Identifier	`BYTE`	`STRING`	Identifier, beginning with `_SID` in most known data
`0x05`	2.0+	System ID	`BYTE`	`STRING`	System ID, in hexadecimal digits
`0x06`	2.0+	Unknown	`WORD`	Varies	`0` in all known data