Extended Boot Record

An extended boot record (EBR), or extended partition boot record (EPBR), is a descriptor for a logical partition under the common DOS disk drive partitioning system. In that system, when one (and only one) partition record entry in the master boot record (MBR) is designated an extended partition, then that partition can be subdivided into a number of logical partitions. The actual structure of that extended partition is described by one or more EBRs, which are located inside the extended partition. The first (and sometimes only) EBR will always be located on the very first sector of the extended partition.

Unlike primary partitions, which are all described by a single partition table within the MBR, and thus limited in number, each EBR precedes the logical partition it describes. If another logical partition follows, then the first EBR will contain an entry pointing to the next EBR; thus, multiple EBRs form a linked list. This means the number of logical drives that can be formed within an extended partition is limited only by the amount of available disk space in the given extended partition.

Read more about Extended Boot RecordEBR Structure and Values, Examples

Other articles related to "boot record, extended boot record, extended, boot":

Logical Disk Manager - Compatibility Problems - Advantages of Using A 1-MiB Alignment Boundary
... alignment boundary is used by the Vista partitioner(s), 1 MiB is "reserved for" the Master boot record (MBR), instead of the traditional 63 sectors (31.5 KiB) ... space that should be reserved for the MBR or an Extended Boot Record(EBR) ... For example, the endings of the "EBR extended partitions" (type 0x05) may overlap other partitions, and it will leave unprecedented amounts of space between an extended boot record and its logical ...
Extended Boot Record - Examples - Snapshot
... stripped, the line annotated with Linux is /dev/hda6 with an extended file system ... Windows NT, and Debian do not insist on any extended partition alignment with a gap \.PHYSICALDRIVE0 (assuming geometry CHS 255. 63) id ... at 24466995, end 254. 63, size 4867695 FAT32 (extended offset 4192965) total 29334690 => EXT CHS 1 ... at 0, end 0. 1, size 06 ... CHS 2 ... at 1, end 254. 63 ...
File Allocation Table - Technical Design - Directory Table - Directory Entry
... references into the file using absolute addressing bypassing the file system (boot loaders, kernel images, swap files, extended attributes, etc.) ... volume label instead, if a EBPB is present in the boot sector (not present with some non-bootable block device drivers, and possibly not writeable with boot ... same feature in various other operating systems, see offset 0x0D if enabled in MSX boot sectors at sector offset 0x026 ...

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