M04474@mwvm.mitre.org (02/12/91)
I have a IIsi which was purchased with a dealer installed 100 Mb Quantum hard disk drive in place of the Apple supplied hard disk. The first thing I noticed was that the time to duplicate a disk file seemed much longer than my old SE/30 with an Apple supplied 80 Mb drive. For example, it take about 30 seconds to duplicate the MS Word application (about 680K) on the si. At work on a 20 Mb Bernoulli disk, a IIcx will duplicate the file in 5 seconds and an SE will do it in 10 seconds. The time is not appreciably affected by the color vs. B&W mode on the si. Note that recent speed tests reported on the net have been for computation speed and not disk I/O. does anyone have any ideas on what makes it so slow? would partitioning the disk help? Has anyone times this on the Apple 80 Mb disk? Thanks, Disk Kalagher
strange@sprite.berkeley.edu (Steve Strange) (02/12/91)
In article <1991Feb11.204940.16723@linus.mitre.org> M04474@mwvm.mitre.org writes: >I have a IIsi which was purchased with a dealer installed 100 Mb Quantum >hard disk drive in place of the Apple supplied hard disk. The first >thing I noticed was that the time to duplicate a disk file seemed >much longer than my old SE/30 with an Apple supplied 80 Mb drive. For >example, it take about 30 seconds to duplicate the MS Word application >(about 680K) on the si. At work on a 20 Mb Bernoulli disk, a IIcx will >duplicate the file in 5 seconds and an SE will do it in 10 seconds. >The time is not appreciably affected by the color >vs. B&W mode on the si. Note that recent speed tests reported on >the net have been for computation speed and not disk I/O. > >does anyone have any ideas on what makes it so slow? would partitioning the >disk help? Has anyone times this on the Apple 80 Mb disk? > This seems rather odd indeed. I have a IIsi with a Quantum 105 low-profile drive that I installed myself (replaced the 40 meg drive) and it does the MS Word application duplication in about 5 seconds. Perhaps the the interleaving on the disk is suboptimal, leading to high sector read latencies? This would be a function of the software used to format the disk. I might suggest reformatting the drive with SilverLining or something, but you would probably rather not erase your whole disk just for an experiment. I suppose it's possible that the MS word application file is severely fragmented on the disk, but a performance degredation of a factor of 6 seems unlikely in this case. Also, you could easily verify that this was not the problem by trying the test on other big files on your disk. Steve UC Berkeley