Backing up and restoring on Linux [CR 333094, CR 533619]

Linux requires that the size of the transfer for read and write to a raw partition be an integral multiple of the device's block size. For a disk, this will be its sector size. Valid sector size values are currently 512, 1024, 2048 and 4096 bytes. Data buffers used to transfer data to and from raw partitions during a backup or restore operation are now aligned to an integral multiple of the device's block size.