光碟上的目录记录区
Table 1. Directory Record BP Field Name Content
1 Length of directory Record (LEN_DR) Bytes
2 Extended Attribute Record Length Bytes - this field refers to the Extended Attribute Record, which provides additional information about a file to systems that know how to use it. Since few systems use it, we will not discuss it here. Refer to ISO 9660:1988 for more information.
3 to 10 Location of Extent This is the Logical Block Number of the first Logical Block allocated to the file.
11 to 18 Data Length Length of the file section in bytes
19 to 25 Recording Date and Time This is recorded in the same format as the Volume Creation Date and Time
26 File Flags One Byte, each bit of which is a Flag:
Bit
0 File is Hidden if this bit is 1
1 Entry is a Directory if this bit is 1
2 Entry is an Associated file is this bit is 1
3 Information is structured according to the extended attribute
record if this bit is 1
4 Owner, group and permissions are specified in the extended
attribute record if this bit is 1
5 Reserved (0)
6 Reserved (0)
7 File has more than one directory record if this bit is 1
27 File Unit Size This field is only valid if the file is recorded in interleave mode. Otherwise this field is (00)
28 Interleave Gap Size This field is only valid if the file is recorded in interleave mode. Otherwise this field is (00)
29 to 32 Volume Sequence Number The ordinal number of the volume in the Volume Set on which the file described by the directory record is recorded.
33 Length of File Identifier (LEN_FI) Byte