Re: st-driver and filemark,eof

[matthias scherrer]

["Followup-To:" nach ch.comp.os.linux gesetzt.]
On Wed, 4 May 2005 06:19:06 +0200, juerg oehler wrote:
> i than rewind the tape and write the first file exactly the same.
> i now would expect same image on tape <file1-fm-file2-fm-eod>.
> where is eod now - why?

IMHO it works like the follow:

(d = data, - = unused, * = Tapemark)

Step 1: Write 2 files on tape:
ddddd*dddddddd**---------------------
(that means that the eod are just 2 tapemarks)

Step 2: Append a 3rd file:
ddddd*dddddddd*ddddddddddddd**-------

Step 3: Overwrite file1 with the same data
ddddd**ddddddd*ddddddddddddd**-------

The second TM has overwritten File2 !!! Depending on the drive it
might be even impossible to access file 3.

Usually you can only append data to tapes.

Greetings
Matthias