why does the partition start on sector 2048 instead of 63
- by gcb
I had two drives partitioned the same and running 2 raid partitions on each.
One died and I replaced it under warranty for the same model.
While trying to partition it, the first partition can only start on sector 2048, instead of 63 that was before. Driver have different geometry as previous and remaining ones. (Fewer heads/more cylinders)
old drive:
$ sudo fdisk -c -u -l /dev/sdb
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000aa189
Device Boot Start End Blocks Id System
/dev/sdb1 * 63 174080339 87040138+ 83 Linux
/dev/sdb2 174080340 182482334 4200997+ 82 Linux swap / Solaris
/dev/sdb3 182482335 3907024064 1862270865 fd Linux raid autodetect
remanufactured drive received from warranty:
$ sudo fdisk -c -u -l /dev/sda
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
81 heads, 63 sectors/track, 765633 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d0b5d
Device Boot Start End Blocks Id System
/dev/sda1 2048 ...
why is that?