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- Newsgroups: comp.compression
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!network.ucsd.edu!qualcom.qualcomm.com!cancun!rdippold
- From: rdippold@cancun.qualcomm.com (Ron Dippold)
- Subject: PKZip 2.04c quick impressions
- Message-ID: <rdippold.726235592@cancun>
- Sender: news@qualcomm.com
- Nntp-Posting-Host: cancun.qualcomm.com
- Organization: Qualcomm, Inc., San Diego, CA
- Date: Tue, 5 Jan 1993 12:06:32 GMT
- Lines: 40
-
- No speed tests yet (I'm running communications and other stuff under
- OS/2 and didn't want to boot DOS for guaranteed single-tasking right
- now), but they've finally caught up their compression with everyone
- else. It gets better than ARJ on some things I tried, worse on
- others. Pretty close. Ditto for Zoo and LZH (they're all in the same
- ballpark). It runs just fine under OS/2 2.0, detecting the CPU
- properly, and using DPMI correctly.
-
-
- I will say, though, that the multidisk capability really, really bites
- hard. You can't do a multivolume pack to anything but a removable
- device. In other words, with ARJ, I can say "Take these files, make a
- multivolume archive destined for 1.4 Meg disks" and it'll make
- CANYON.ARJ, CANYON.A01, CANYON.A02 right on my hard drive, so I can
- upload to ftp and people with only floppies can transfer it to hard
- drives.
-
- With the new ZIP, every file on each floppy is named CANYON.ZIP, and
- there's a separate file named PKBACK#.001, PKBACK#.002, PKBACK#.003
- depending on which disk it is. Again, this makes it impossible
- (without some renaming trickery using multitasking) to have a
- multivolume archive sitting on your hard disk, then extract the
- contents to someplace on the disk. This sucks, big time.
-
- What's going to happen is that people will do a multidisk archive (to
- agonizingly slow floppies, since they have to), then they'll need to
- ZIP each floppy back to the hard disk with different names, or use
- something like Teledisk to pack the entire disk. Now do that all in
- reverse for unpacking. This is the situation where you definitely
- want to use ARJ instead. If I recall correctly, ARJ didn't have the
- "multivolume to hard disk" option originally, but added it later. The
- PKZip naming convention makes that impossible, unless they change that
- as well.
-
- It did handle it nicely when I threw a floppy with a bad sector at it.
- It just stopped packing at that point and asked for the next disk, and
- continued from there.
-
- --
- The pen is mightier than the pencil.
-