Master boot record

Strukturen til en MBR:
Adresse Beskrivelse Størrelse
i
byte
Hex Des
0000 0 Kodeområde maks.
446
01B8 440 Valgfri Disksignatur 4
01BC 444 Vanligvis nuller; 0x0000 2
01BE 446 Tabell med primærpartisjoner
(Fire 16-byte oppføringer, IBM Partisjonstabelloppsett) 		64
01FE 510 55h MBR signatur;
0xAA55 		2
01FF 511 AAh
MBR, total størrelse: 446 + 64 + 2 = 512

Master Boot Record (MBR), eller Hovedpartisjonssektor, er en 512 byte-størrelses oppstartsektor som er den første sektoren («Sektor 0») av et partisjonert lagringsmedium, slik som en harddisk (oppstartsektoren til en upartisjonert enhet er kalt Volume Boot Record). Inneholder kodeområdet sett til høyre i tabellen maskinkodet program, blir det noen ganger kalt å bootstrappe operativsystemer, er bindet merket som oppstartelig, og BIOS oppsatt til å starte fra enheten. Sektoren brukes noen ganger for å holde deler av et mediums partisjonstabell; og noen ganger for å unikt identifisere individuelle lagringsmedia med en 32-bit datasignatur, selv om det på noen maskiner er helt ubrukt.[1][2][3][4]

På grunn av en bred popularitet av IBM PC-kompatible datamaskiner, er denne typen MBR mye brukt, til en slik grad at den støttes av, og integreres i, andre datamaskintyper, inkludert nyere multiplattform-standarder for bootstrapping og partisjonering.

MBR fungerer kun på harddisker 2tb>, og man kan lage maks 4 partisjoner. Den nyere løsningen, GPT, løser begge problemer med å støtte nesten ubegrenset antall partiasjoner og størrelse på harddisk.

Referanser

  1. ^ Peter C Norton and Scott Clark (2002). Peter Norton's New Inside the PC. Sams Publishing. s. 360–361. ISBN 0-672-32289-7. 
  2. ^ Michael W. Graves (2004). A+ Guide To PC Hardware Maintanence and Repair. Thomson Delmar. s. 276. ISBN 1-4018-5230-0. 
  3. ^ Jean Andrews (2003). Upgrade and Repair with Jean Andrews. Thomson Course Technology. s. 646. ISBN 1-59200-112-2. 
  4. ^ William Boswell (2003). Inside Windows Server 2003. Addison-Wesley Professional. s. 13. ISBN 0-7357-1158-5. 

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