Testdisk analyse cylinder read error1/5/2024 This problem is not limited to DOS users. It becomes harder for partition recovery utilities to find lost partitions on the hard disk. When the partition table is cleared or corrupted, the physical disk geometry may be used instead. To access data, the BIOS and the operating system (DOS/Win9x) used CHS addressing.ĬHS values are limited to 1023 cylinders, 255 heads and 63 sectors (8 GB).Ī common trick introduced with hard drives bigger than 504 MB (1023 cylinders, 16 heads, 63 sectors) was to use a geometry (Cylinder/Heads/Sector) different from the physical geometry (Extended CHS or large mode addressing).Ī method used by BIOS is to read the partition table and to guess the number of heads. HD sectors are numbered 0,1, 2 up to N-1 where N is the total number of sectors.īut before IDE disks larger than 8 GB and SCSI disks existed, another method was used. To access data, modern operating systems use logical block addressing.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |