191     fn validate(&self, bpb: &BiosParameterBlock) -> Result<(), SystemError> {  in validate()
192         if bpb.fat_size_16 != 0 {  in validate()
197         if bpb.root_entries_cnt != 0 {  in validate()
202         if bpb.total_sectors_16 != 0 {  in validate()
234         let mut bpb = BiosParameterBlock::default();  in new()  localVariable
236         cursor.read_exact(&mut bpb.jmp_boot)?;  in new()
237         cursor.read_exact(&mut bpb.oem_name)?;  in new()
238         bpb.bytes_per_sector = cursor.read_u16()?;  in new()
239         bpb.sector_per_cluster = cursor.read_u8()?;  in new()
240         bpb.rsvd_sec_cnt = cursor.read_u16()?;  in new()
241         bpb.num_fats = cursor.read_u8()?;  in new()
242         bpb.root_entries_cnt = cursor.read_u16()?;  in new()
243         bpb.total_sectors_16 = cursor.read_u16()?;  in new()
244         bpb.media = cursor.read_u8()?;  in new()
245         bpb.fat_size_16 = cursor.read_u16()?;  in new()
246         bpb.sector_per_track = cursor.read_u16()?;  in new()
247         bpb.num_heads = cursor.read_u16()?;  in new()
248         bpb.hidden_sectors = cursor.read_u32()?;  in new()
249         bpb.total_sectors_32 = cursor.read_u32()?;  in new()
270         bpb.trail_sig = cursor.read_u16()?;  in new()
273         let root_sectors = ((bpb.root_entries_cnt as u32 * 32) + (bpb.bytes_per_sector as u32 - 1))  in new()
274             / (bpb.bytes_per_sector as u32);  in new()
277         let fat_size = if bpb.fat_size_16 != 0 {  in new()
278             bpb.fat_size_16 as u32  in new()
284         let total_sectors = if bpb.total_sectors_16 != 0 {  in new()
285             bpb.total_sectors_16 as u32  in new()
287             bpb.total_sectors_32  in new()
292             - ((bpb.rsvd_sec_cnt as u32) + (bpb.num_fats as u32) * fat_size + root_sectors);  in new()
294         let count_clusters = data_sectors / (bpb.sector_per_cluster as u32);  in new()
297         bpb.fat_type = if count_clusters < FATFileSystem::FAT12_MAX_CLUSTER {  in new()
309         bpb.validate()?;  in new()
311         return Ok(bpb);  in new()