221
edits
Partition Table: Difference between revisions
m
→MBR: added one little number
m (Added a link) |
m (→MBR: added one little number) |
||
| Line 97: | Line 97: | ||
* CHS fields "max out" on a drive that is approximately 8GB in size -- and are therefore useless on almost all current drives. | * CHS fields "max out" on a drive that is approximately 8GB in size -- and are therefore useless on almost all current drives. | ||
* For drives smaller than 8GB, the LBA fields and the CHS fields must "match" when the values are converted into the other format. | * For drives smaller than 8GB, the LBA fields and the CHS fields must "match" when the values are converted into the other format. | ||
* For drives bigger than 8GB, generally the CHS fields are set to Cylinder = 1023, Head = 255, Sector = 63 -- which is considered an invalid setting. | * For drives bigger than 8GB, generally the CHS fields are set to Cylinder = 1023, Head = 254 or 255, Sector = 63 -- which is considered an invalid setting. | ||
* If a Partition Table entry is unused, then it should be set to all 0. | * If a Partition Table entry is unused, then it should be set to all 0. | ||
* A System ID byte value of 0 is the definitive indicator for an unused entry. | * A System ID byte value of 0 is the definitive indicator for an unused entry. | ||
| Line 105: | Line 105: | ||
The System ID byte is supposed to indicate what filesystem is contained on the partition (ie. Ext2, ReiserFS, FAT32, NTFS, ...). | The System ID byte is supposed to indicate what filesystem is contained on the partition (ie. Ext2, ReiserFS, FAT32, NTFS, ...). | ||
There was never any standard created for the System ID byte -- which means that Microsoft went and tried to hog almost all of the possible values. | There was never any standard created for the System ID byte -- which means that Microsoft went and tried to hog almost all of the possible values. | ||
See [[#External Links|the links below]] for tables of values of the System ID byte, for filesystems that have been lucky enough to aquire | See [[#External Links|the links below]] for tables of values of the System ID byte, for filesystems that have been lucky enough to aquire their own value by common consensus. | ||
their own value by common consensus. | |||
If you create your own custom filesystem, then you can simply pick a System ID value for your filesystem that seems to be unused. | If you create your own custom filesystem, then you can simply pick a System ID value for your filesystem that seems to be unused. | ||