Sunday brain tickler

On 01/08/2017 06:25 PM, allison wrote: I've certainly seen my share of various filesystems. In fact, I can laboriously reconstruct the original files, there being only 70 1200 byte blocks on the disk. I thought that having a file name might be useful. I'm just a bit weary of deciphering this one-off and can't get my mind in the right frame to paw through the directory structure. But I put it to you that there exactly 72 (or 71) entries in this list and there are exactly 70 1200-byte blocks--and, make no mistake, they are 1200-byte blocks with a definite format--a header followed by text. Short blocks are denoted by a control character sequence, after which old data to the end of the block may be found. So it's quite possible to splice the bits together into complete documents. But that's cheating--I'd like to understand how the first block directory dictates the relationship between blocks and any file names. So let's look at the directory again--note the 11th bytes all either have values less than 70 (decimal). I'm guessing that that's a forward link to the next block--note that 7F is the only out-of-range value present in this column. I suspect that this is the end-of-file marker. This is all guessing at this point. --Chuck