Particijske tablice i njeni dijelovi

[strgani]

sljedeći tekst našao sam na jednoj web stranici, stavit cu i link, podebljani dio me zanima dal mi moze netko objasnit sta znaci, nisam expert u engleskom pa me taj dio muci, ostatak sam skuzio treba mi za maturalni, hvala

A partition descriptor is a 16-byte structure with the following fields:

0 Boot Indicator
[This byte is used by some boot loaders to indicate which of the primary partitions should be booted.]

1-3 Begin CHS
[Cylinder/Head/Sector address of the partition start. For the format, see below.]

4 Partition Type
[This type generally indicates what operating system or file system can be found on the partition, or what the partition is used for. For a list, see the list of known partition types.] Here we shall always give types in two hexadecimal digits. Types 05, 0F and 85 (hex) indicate an extended partition. [DOS only knows about 05, Windows 95 introduced 0F, Linux introduced 85.]

5-7 End CHS
[Cylinder/Head/Sector address of the partition end.]

8-11 Partition Start
The 4-byte little-endian value of the starting sector number (counting from 0) of the partition.


12-15 Partition Size
The 4-byte little-endian value of the size in sectors of the partition. If this value is zero, the partition descriptor should be ignored [and all other values in the descriptor should be zero as well]; in this case the partition descriptor is called unused.


http://www.win.tue.nl/~aeb/partition..._tables-2.html

[strgani]

The 3-byte CHS adresses are encoded as follows: The first byte contains h, the head number, a value in the range 0-255. The second byte contains in its last six bits s, the sector number, a value in the range 1-63. The high order two bits of the second byte, followed by the eight bits of the third byte form c, the cylinder number, a value in the range 0-1023. In C-like code:
h = byte1;
s = byte2 & 0x3f;
c = ((byte2 & 0xc0) << 2) + byte3;
For a disk with C cylinders, H heads, and S sectors per track, the linear address corresponding to a CHS address (c,h,s) is found as c*H*S + h*S + s - 1. [Since CHS addresses have 24 bits only, they cannot address more than 2^24 sectors, which is insufficient for modern disks. Moreover, it is often unclear what values should be used for C, H, S. Thus, these CHS addresses should be ignored.]


i taj me dio zanima ali samo ovaj treci dio za cilindre ne kuzim kak se racuna...

[perich]

Autor strgani

8-11 Partition Start
The 4-byte little-endian value of the starting sector number (counting from 0) of the partition.

In computing, endianness is the ordering of individually addressable sub-units (words, bytes, or even bits) within a longer data word stored in external memory. The most typical cases are the ordering of bytes within a 16-, 32-, or 64-bit word, where endianness is often simply referred to as byte order.[1] The usual contrast is between most versus least significant byte first, called big-endian and little-endian respectively.

source: wiki

[m4dm4n]

Autor strgani

sljedeći tekst našao sam na jednoj web stranici, stavit cu i link, podebljani dio me zanima dal mi moze netko objasnit sta znaci, nisam expert u engleskom pa me taj dio muci, ostatak sam skuzio treba mi za maturalni, hvala

8-11 Partition Start
The 4-byte little-endian value of the starting sector number (counting from 0) of the partition.

Početni sektor particije na disku, LBA adresiranje.

[strgani]

Autor m4dm4n

Početni sektor particije na disku, LBA adresiranje.

tnx... jel mi mos jos samo onaj dio o racunanju cilindara, kak se racuna, skuzio sam za s i h al me c muči :/ a mi nije pomogo...

[Milentije]

Evo nacrtao sam na papiru i napisao objasnjenje. Ono sto sam zaboravio napisati na papiru je to da je maska koja se dobija sa c0 11000000. Kada byte2 pomnozis tom maskom ostanu ti samo najviša 2 bita drugog bajta setovana a svi ostali bitovi se resetuju. Dalje sam napisao sta se desava i kako.



EDIT:

Krajnji raspored bita izgleda ovako:

87654321 65432187 87654321

H
S
C