25 Jan
2001
25 Jan
'01
12:44 p.m.
From: Jerome Fine <jhfine(a)idirect.com>
Jerome Fine replies:
Just curious - if you are referring to software distributions and
especially
RT-11 (maybe I am confused), in most cases, the RL02
will not be filled
I had other non RT-11 stuff... Also I have a RT-11 disti that is the
high
priced spread (macro with comments) and that does fill the disk. The
standard V5.x BIN disti is maybe 30% of the disk.
With say RT-disk I'd archive (same for RSTS) is to do a SQueeze.
Of course you want to image copy (RSX) and unix V7.
Of course if the RL02 was full, Allison is correct that
a single RD52
will hold only 3 RL02 disk packs and in much less volume.
I know. ;) Though a few were partitioned so I could run them as
if they were nominal RL02. That wastes space if they were to be pure
archival.
Currently, I have managed to find a very OLD Magneto
Optical disk
drive with cartridges that hold 295 MBytes (8.75 RT-11 partitions)
on each side. That is the equivalent of 26 RL02 disk packs on
each side or a total of 52 RL02 disk packs on the MO cartridge
That works. I also have that archive on DLT (TK50).
I also duplicate important cartridges. I suspect that
the MO cartridges
will last longer that the MO disk drives. Of course, I also had to
acquire a SCSI host adapter as well - considerably more costly
than 8 free RD52 drives, but each MO cartridge is MUCH smaller
that the 17 RD52 disk drives it replaces.
Yep, though the RD52s are likely the most reliable of the pack
and if the problem is not in the HDA a board swap is possible.
It was a direct approach.
Next pass will be to move them to a PC with a Cdburner.
Allison
26 Jan
26 Jan
7:54 a.m.
ajp166 wrote:
Just curious -
if you are referring to software distributions and especially
RT-11 (maybe I am confused), in most cases, the RL02 will not be filled
I had other
non RT-11 stuff... Also I have a RT-11 disti that is the high
priced spread (macro with comments) and that does fill the disk. The
standard V5.x BIN disti is maybe 30% of the disk. Of course if
the RL02 was full, Allison is correct that a single RD52
will hold only 3 RL02 disk packs and in much less volume.
I know. ;) Though a few
were partitioned so I could run them as
if they were nominal RL02. That wastes space if they were to be pure
archival. Currently, I
have managed to find a very OLD Magneto Optical disk
drive with cartridges that hold 295 MBytes (8.75 RT-11 partitions)
on each side. That is the equivalent of 26 RL02 disk packs on
each side or a total of 52 RL02 disk packs on the MO cartridge
That works. I also
have that archive on DLT (TK50). I also
duplicate important cartridges. I suspect that the MO cartridges
will last longer that the MO disk drives. Of course, I also had to
acquire a SCSI host adapter as well - considerably more costly
than 8 free RD52 drives, but each MO cartridge is MUCH smaller
that the 17 RD52 disk drives it replaces.
Yep, though the RD52s are likely the most
reliable of the pack
and if the problem is not in the HDA a board swap is possible.
It was a direct approach. Next pass will be to move them to a PC with a
Cdburner.
Now this is one area I would like to solve as well. But what
OS is needed if I want to use the first 64 blocks on the CD?
And could I take two of the MO cartridges and burn them onto
a single RT-11 bootable CD?
Sincerely yours,
Jerome Fine
8773
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