![]() ![]() To access data, modern operating systems use logical block addressing. 3.2 How to find the correct number of sectors?.3.1 How to find the correct number of heads?.2 How does TestDisk get the disk geometry?.Choosing the wrong geometry settings and then saving any lost partitions based on those faulty settings might make it harder or impossible to recover your data. It does not affect the hard drive itself, unless you actually write data about lost partitions to the drive. Using partition aligned on 1MB boundaries give better performance for RAID device, SSD, computer virtualization (VMware, Hyper-V.).ĬHS numbers change the way that TestDisk looks for partitions and calculates their sizes, etc. More recent programs use 1MB boundaries, it's the default for Windows Vista/7/2008 and later, RedHat Enterprise Linux 6 and later.Usually PC partitioning programs found on Dos, Windows 9x/2000/XP/2003, RedHat Enterprise Linux 5 and before make partitions start and end on cylinder boundaries.Ĭhange hard disk geometry parameters (Cylinders, Heads, Sectors). PC partitioning programs often make partitions end on cylinder boundaries.Ī partition's CHS values are based on disk translations which make themĭifferent than its physical geometry. TestDisk 6.2-WIP, Data Recovery Utility, November 2005ĭisk /dev/sda - 120 GB / 111 GiB - CHS 14593 255 63, sector size=512īecause these numbers change the way that TestDisk looks for partitionsĪnd calculates their sizes, it's important to have the correct disk geometry. ![]()
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