i want to combine a 30gbyte seagate udma66 with a wd 80gbyte umda100 harddisc.
can you recommend it or will i get a bandwith problem bcause of udma66/100 combination (my motherboard is a asus tusl-c)
another question:
which of the two disc should be the master. or should i set both disc to master and the cd-roms to slaves?
thanks for any help
is it possible to combine udma66 and udma100 harddisc withou
a (parallel) IDE chain will always set to the speed of the slowest device. A chain can contain up to 2 devices, and most motherboards have at least 2 controllers (hence 2 connectors) for a total of 4 devices.
So having an ATA/100 and an ATA/66 device connected to the same chain will limit both drives to ata-66 speeds. In addition to the ATA/DMA modes 1,2,3 etc there are also PIO modes which are MUCH slower and tax your cpu quite a bit more. Most inexpensive cd-rom units are PIO mode 4, although I've been told now some cd-rom/cdrw devices are dma capable I've not used any (Most DVD devices are dma capable.) This means that a cd-rom unit capable of only PIO Mode 4 will lock the whole chain in PIO mode and slow down any modern harddrive attached.
At every company I've worked for in the last 5 years the techs would put a cheap 5200 rpm dma/66 harddrive and a cheap 12-24x cd-rom on a single cable for every machine they have control over.
note: motherboards with RAID chipsets for an additional 2 ports/4 devices may saturate your pci bus. These chips don't benefit from the extra addressing lines that most modern chipset makers give to the ide to bypass the pci bus altogether. This holds tru for aftermarket RAID cards like the ones Promise makes.
So having an ATA/100 and an ATA/66 device connected to the same chain will limit both drives to ata-66 speeds. In addition to the ATA/DMA modes 1,2,3 etc there are also PIO modes which are MUCH slower and tax your cpu quite a bit more. Most inexpensive cd-rom units are PIO mode 4, although I've been told now some cd-rom/cdrw devices are dma capable I've not used any (Most DVD devices are dma capable.) This means that a cd-rom unit capable of only PIO Mode 4 will lock the whole chain in PIO mode and slow down any modern harddrive attached.
At every company I've worked for in the last 5 years the techs would put a cheap 5200 rpm dma/66 harddrive and a cheap 12-24x cd-rom on a single cable for every machine they have control over.
note: motherboards with RAID chipsets for an additional 2 ports/4 devices may saturate your pci bus. These chips don't benefit from the extra addressing lines that most modern chipset makers give to the ide to bypass the pci bus altogether. This holds tru for aftermarket RAID cards like the ones Promise makes.
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helldriver
- Posts: 273
- Joined: Fri Aug 31, 2001 4:00 pm
even if my system is reduced to udma66 i should have enough headroom for my discdrives, because the umda 66 disc streams with a maximum of 20mb and the udma100 disc streams with maximum of 40 mb per second. and as far as i know udma is capable of a 66mb stream per second. so it seems to be enough.
by the way, whats with connecting the umda100 disc as th first master, my 32 cd-rom-burner as first slave and the udma66 disc as second master and the dvd-rom as as second slave?
can you recommend this configuration?
by the way, whats with connecting the umda100 disc as th first master, my 32 cd-rom-burner as first slave and the udma66 disc as second master and the dvd-rom as as second slave?
can you recommend this configuration?
Hard Drives as Masters (ide 1 and ide 2). CD Rom and/or CDRW as slaves. Check http://www.tascam.com for important tips.
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helldriver
- Posts: 273
- Joined: Fri Aug 31, 2001 4:00 pm