DEC pack, unpack and disk-images

[Curbie]

Pedroski55,

first off, Thanks for the code you posted yesterday, after some monkeying around, it works just fine for what I want.

def read_sector(disk, sector_no=0):
    """Read a single sector of the specified disk.

    Keyword arguments:
    disk -- the physical ID of the disk to read.
    curbie -- or full file path to disk image file.
    sector_no -- the sector number to read (default: 0).
    """
    # curbie -- defined disk sector notes
    # D_INFO = 0                    # disk info block
    # D_LABEL = 1                   # disk label
    # D_MFD = 2                     # disk master file directory

    # File operations with `with` syntax. To reduce file handling efforts.
    with open(disk, 'rb') as fp:    # open file read binary, get file descriptor
        fp.seek(sector_no * 512)    # seek file to byte (sector * 512)
        read = fp.read(512)         # read sector
    return read                     # return sector

sector = read_sector("/media/curbie/0012-D687/For Curbie/Zulu/HD.IMG", 2)

print(sector)                       # print sector as byte array

and returns

b'\x02\x01\x19\x00\x00\x00\x00\x00\x04\x01\xa9\x00\x00\x00\x00\x00\x06\x010\n\x00\x00\x00\x00\x02\x02K\x19\x00\x00\x00\x00\x00

which i recognize as BIG endian octal 1,2 on sector x19, then 4 rad50 bytes, 1,4 on sector xa9, then 4 rad50 bytes,...

the SD is a replacement disk for a machine's old ST506 MFM type drive, first i hope to read from it and write to it from my Linux machine, then the sky is the limit, playing with these old machines is my hobby.

Curbie

curbie