ms_lib_erase_phyblock
switch (ms_lib_erase_phyblock(us, blk)) {
ms_lib_erase_phyblock(us, PhyBlock);
ms_lib_erase_phyblock(us, PhyBlock);
ms_lib_erase_phyblock(us, PhyBlock);
ms_lib_erase_phyblock(us, newblk);