🚀 go-pugleaf

In article <CHzDAu.DnL@bigtop.dr.att.com> dfh@dwroll.att.com writes:
>> : I wouldn't go saying thatthe Colorado systems give 250 meg.  They don't, 

>> : get VERY hot in normal use.  Also, they seem to go forward and backward 
>> : during a restore, I don't understand this.
>> 
>> That's because they have multiple tracks so they only read one track at 
>> each pass and then goes backwards while reading/writing another track and 
>> so on.
>
>????  I don't think this is correct.  When I am _writing_ a tape, my
>drive will stream (continue on without backing up) for exactly 2 minutes
>and 15 seconds.  Then there is a brief 2 second pause (not a rewind) and
>it streams again for 2:15.

The QIC-80 tapes have 28 tracks, 150 blocks each track, and 32K Bytes 
each block. So, the real capacity is 28 * 150 * 32 KB = 134400KB.
If the brief 2 second pause occurs at block 150, 300, ... every 2:15min 
then your backup software is using the drive at HALF the speed.
CPBACKUP for DOS have this problem. NB or CPB/win don't have this
problem. Jumbo303/403 also have good speed, but doesn't show the
block number during tape operation. Also note that some PC's floppy
drive controller can't support FULL speed. 

Tai-Shan Lin
tlin@eecs.wsu.edu


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