python3 -c "
# Read actual PERC metadata chunks - these are NOT zeros
# They're at every 5th chunk position on each physical disk
# For disk 0 (sda), metadata chunks are at:
# phys_byte = data_offset + group*5*CHUNK + 4*CHUNK
# i.e., chunk positions 4, 9, 14, 19... of each disk

CHUNK = 128*512  # 64KB
LV_START = 5120000*512

# Read first few metadata chunks from sda
with open('/dev/sda','rb') as f:
    for chunk_num in [4, 9, 14, 19, 24]:
        phys = LV_START + chunk_num * CHUNK
        f.seek(phys)
        data = f.read(512)
        nonzero = sum(1 for b in data if b != 0)
        print(f'sda metadata chunk {chunk_num}: '
              f'phys={phys} nonzero={nonzero}/512 '
              f'first8={data[:8].hex()}')
"
