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View Full Version : big hd speed drop after installing new hd... why?

takeru
19th March 2002, 17:38
before i had these two hd's on the same ide cable:
ibm 46gig 7200rpm ata66 : cache speed 36.5meg/s
wd 120gig 7200rpm ata100: cache speed 47.1meg/s (8meg cache)

then i swapped the 46gig out, so now it's:
wd 120gig 7200rpm ata100: cache speed 36.4meg/s (8meg cache)
wd 120gig 7200rpm ata100: cache speed 15.3meg/s (8meg cache)

ibm 46gig 7200rpm ata66 : cache speed 36.1meg/s (on another cable now)

after running cache speed test several more times, the second 120gig hd averaged around 30.5meg/s. wtf? how can putting in a second faster drive slow everything down that much? am i missing something here? i am running windows 2000.

update:
after much rebooting and shutting down and testing different hd combinations. it is now clear nothing physical is affecting the performance of the drives, at least not to that large of an extent. the one thing left i can think of is this: if i look under device manager and under disk drives, all 5 of my hd's for some reason are scsi(?!), this is impossible, as only one of my hd's is scsi. the other 4 are ata100 udma ide. this is what it looks like:

Disk drives:
IBM-DTLA-307045 SCSI Disk Device
WDC WD12 00JB-00CRA0 SCSI Disk Device
WDC WD12 00JB-00CRA0 SCSI Disk Device
WDC WD80 0BB-40BSA0 SCSI Disk Device
WDIGTL WDE18310 ULTRA2 SCSI Disk Device

is there any way i can fix this? this problem is starting to annoy the hell outta me, and its preventing me from continuing my capture encode experiments.
gooki
20th March 2002, 04:33
have you set the new hdd to dma mode in windows 2k?
takeru
20th March 2002, 04:44
all are in ultra dma 5
chemmajik
23rd March 2002, 01:42
You might want to reinstall your motherboard drivers & ide/scsi controller drivers, sometimes it will help. Sometimes forcing the mode of the hd into udma mode 5 in bios helps.
takeru
29th March 2002, 07:42
this is from a fresh install. either way, somehow now i got them back to being known as normal ide drives. i stuck in another 120gig 2meg cache drive (wd1200bb) and it maintains roughly a 47meg/s cache speed, double that of the 8meg cache drives (?!). even if i raid the two 8meg cache drives together the speed varies between 26meg/s and 56meg/s.
twist2
12th April 2002, 04:43
that's a very nice setup. I was wondering what power supply you're using and if you're using scsi cd-roms then? just curious , thanks.
takeru
12th April 2002, 08:04
Antec 1030 Case
Enermax 431watt PSU
Athlon XP 1700+
Alpha PAL8045
3x Sunon 80mm 40cfm fans

Soyo Dragon Plus Motherboard
2x 256 PC2400 Corsair DDR
Asus 8200T2 Deluxe

3x scsi cd drives
1x wd ultra scsi lvd 18gig 8meg cache 10000rpm (boot drive)
1x ultimate hd cooler with dual fan and large blue heatsink

2x wd 120gig 8meg cache 7200rpm (raid capture drive)
1x wd 120gig 2meg cache 7200rpm (storage drive 1)
1x wd 80gig 2meg cache 7200rpm (storage drive 2)
1x ibm 46gig 4meg cache 7200rpm (misc utils, games, etc)

i would throw in more hd's but i ran outta bays :)