diff --git a/doc/boot_sectors.txt b/doc/boot_sectors.txt index 62233de..9e31f50 100644 --- a/doc/boot_sectors.txt +++ b/doc/boot_sectors.txt @@ -68,9 +68,9 @@ intervals for: - Directory trees, tables, boot catalog, embedded partitions and filesystems. - Data file content, including content of El Torito boot images. -The Boot Record is an ECMA-119 Volume Descriptor which is eventually located -at 2 kB block number 17 (decimal). Its content points to the location of the -Boot Catalog. +The Boot Record is an ECMA-119 Volume Descriptor which is located at 2 kB block +number 17 (decimal), if present at all. Its content points to the location of +the Boot Catalog. The format is described in part by ECMA-119 8.2 "Boot Record" and further specified by El Torito figure 7. @@ -177,7 +177,7 @@ Byte Range | Value | Meaning | | 5 - 5 | 0 | Unused | | - 6 - 7 | sec_count | Sector Count. + 6 - 7 | sec_count | Sector Count. Sector size 512: | | "the number of virtual/emulated sectors the system | | will store at Load Segment during the initial boot | | procedure." @@ -232,7 +232,7 @@ Byte Range | Value | Meaning | | 0 if not emulation == 4. 5 - 5 | 0 | Unused | | - 6 - 7 | sec_count | Sector Count. + 6 - 7 | sec_count | Sector Count. Sector size 512. | | See above Initial/Default Entry | | libisofs stores 1 for emulated boot_media and a | | user defined value for boot_media == 0. Often: 4.