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1994-06-01
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S - PACK
One programme for all your file-packing requirements. Uses include
HD-backup, archiving, preparing programmes/data/texts for data transfer or
distribution on floppies.
Special features are:
o
Unbeatable compression. Produces smaller backups, archives, packs, than
ANY other programme, with the possible exception of Meixner's SHRINK, on
which S-PACK's compression is based.
o
Produce single or multi-disk packs.
o
Packs can be self-unpacking.
o
Output is in the form of normal files on normal disks.
o
Can transfer files of any size to floppies - such as those multi-megabyte
animations - and rejoin the sections on unpacking.
o
Single files can be extracted from multi-file packs.
o
Unpacks to ram, harddisk, or floppy.
o
Content index always available.
o
In the event of a disk defect or corruption of a pack there is a REAL
possibility that the bulk of data can be recovered.
o
Does not need any special libraries or handlers.
o
Small enough (28K) to be kept in your C directory.
o
OS1.3, OS2, OS3.
The price to be paid for these is that S-Pack is slower than some
dedicated Archivers and HD Backup programmes, and that the facilities
are relatively scanty. Some comment on these may be useful.
FACILITIES.
The facilities included are those that I NEED; facilities that are merely
a minor convenience are excluded. I never do partial or incremental backup
or restore, inclusion of filenotes and the dozens of other options in most
archivers are of no concern to me - or, I suspect, most people. If there
is an option which YOU find essential please let me know. I will include it
if it can be done without producing incompatability between versions.
SPEED.
Comparisons given by programme writers are always highly suspect; the
most trustworthy figures are those you get when trying out the programme on
your own setup. However . . .
A4000/040, backing up a 11Mbyte HD partition to floppy, including a small
allowance for setting up & changing disks:
Programme Backup Restore Disks note
BRU 20 mins 20 mins 15 1
HDBackup 21 mins 19 mins 19 2
A-BACKUP 15 mins 14 mins 9
BACKUP 16 mins 15 mins 8
LHA 20 mins 9 mins 6.8 3
S-PACK 17 mins 16 mins 5.5 4
notes: 1 BRU is of course called by HDBACKUP, but offers compression opts
2 no compression
3 provided that you have paid $US20 for the registered version
4 the remainder of the 6th disk is available for use.
The `restore' speed of LHA should be noted - although one always hopes
that the backup will never need to be restored!
The time figure for S-Pack must be qualified in two ways:
When writing normal files to floppies, speed is heavily dependant on
the "Addbuffers" figure. In this test I used a figure of 200 but
anything over 100 should give reasonable results.
The compression method used is a fair bit slower than those used by the
other programmes. On the A4000 this is not serious, but it will become
a lot more obvious on slower machines.
DATA TRANSFER
When preparing a set of files for data transfer, particularly by modem, the
best packer/archiver is the one that reduces the size of the data the most.
The self-unpacking capability will remove any worry as to whether the data
can be unarced or unpacked by a recipient.
S-Pack has been developed and thoroughly tested on a 4000/040, and checked
out as far as possible on a 500 (OS1.3) without a hard disk. It should be OK
on any other system. I would however advise that you test it thoroughly on
YOUR system before committing the critical task of backing-up your harddisk
to it.
I have not been able to check whether it will back up to, and recover from
tape, and would greatly appreciate it if someone with the necessary equipment
could test it and let me know the result.
Chas.