...
The file pointer points to the first sector. A sector is 62+2 bytes length. Two bytes for the link to the next followed by 62 bytes of data. When the sector is the last one, the first byte is zero followed by the sector length. Each page allocated to the file system holds up to 4 sectors (or 1 DOR and 3 sectors...).
RAM device
Each RAM device is tagged at address $000000 with $A55A followed by a byte with the size of RAM device (size in banks).
$000000 : $5A $A5 $01 for a 32K internal RAM
$000000 : $5A $A5 $1F for a 512K internal RAM
File DOR
The file DOR length is up to 64 bytes. Its layout is fixed and should respect the specified order. It contains father, brother and son followed by file informations consisting of a key, data length, data.
...