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.
Other articles related to "boot record, extended boot record, extended, boot":
... 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 ...
... 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 ...
... 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 ...
Famous quotes containing the words record, extended and/or boot:
“When our kids are young, many of us rush out to buy a cute little baby book to record the meaningful events of our young childs life...But Ive often thought there should be a second book, one with room to record the moral milestones of our childs lives. There might be space to record dates she first shared or showed compassion or befriended a new student or thought of sending Grandma a get-well card or told the truth despite its cost.”
—Fred G. Gosman (20th century)
“I have been accustomed to make excursions to the ponds within ten miles of Concord, but latterly I have extended my excursions to the seashore.”
—Henry David Thoreau (18171862)
“... until the shopkeeper plants his boot in our eyes,
and unties our bone and is finished with the case,
and turns to the next customer, forgetting our face
or how we knelt at the yellow bulb with sighs
like moth wings for a short while in a small place.”
—Anne Sexton (19281974)