Mac OS 9 Lives
Mac OS 9 Discussion => Hardware => Storage => Topic started by: supernova777 on March 27, 2014, 05:51:23 AM
-
(http://www.nightfallcrew.com/wp-content/gallery/apple-power-mac-g4-mdd-m8570/IMG_2079.jpg)
so i was just looking inside my mdd 867mhz
and i realized it says ATA33 on the ide connection that the cd/dvd drives are connected to..
2 connections near that area..
1x ATA33, and 1 x ATA66,
i believe the ATA100 connection is over at the back near the processor + rear of the machine
which would make that the preferred location for your boot drive? having your disk on the faster ata-100 connection..
but of course on mine, im using the Sata PCI adapter for my boot drive from a sata drive..
which has left both the ata-66 + ata-100 connections empty..
i just tried to plug the cd/dvd drives into the ATA-66 connection
but the cable was too short to reach!
which leaves me wondering..are all cd/dvds unable to read at ata-66 speeds anyway?
or was this a limitation of 2002 era.. ? and also leaves me wondering that.. if i was to swap out this ide cable
for a longer one, would there be any benefit of attaching my cd/dvd drives to the available ATA-66
ide connection... i wonder if this would yielf faster install times when installing from cd/dvd media?
or faster disc burning times?
perhaps they made this cable short because cd/dvd drives of 2002 were not able to reach throughput exceeding the bandwidth
of ATA-33 connection? my next question would be.. how fast is the fastest cd/dvd drive in mb/s throughput?
im now looking up further info on the topic of ata bandwidth related to cd/dvds
http://hardforum.com/showthread.php?t=1238955
this thread speculates that having a slower ata-33 device as a master on an ata-66 connection would slow down the other device to ata-66 speed
no question there is a difference in speed between ata-33 + ata-66... now i just have to find out what speed my dvd drive is capable of..
thoughts?
-
http://en.wikipedia.org/wiki/CD-ROM
Common data transfer speeds for CD-ROM drives
Transfer speed KiB/s Mbit/s MiB/s [10] RPM
1× 150 1.2288 0.146 200–500
2× 300 2.4576 0.293 400-1,000
4× 600 4.9152 0.586 800–2,000
8× 1,200 9.8304 1.17 1,600–4,000
10× 1,500 12.288 1.46 2,000–5,000
12× 1,800 14.7456 1.76 2,400–6,000
20× 1,200–3,000 up to 24.576 up to 2.93 4,000 (CAV)
32× 1,920–4,800 up to 39.3216 up to 4.69 4,800 (CAV)
36× 2,160–5,400 up to 44.2368 up to 5.27 7,200 (CAV)
40× 2,400–6,000 up to 49.152 up to 5.86 8,000 (CAV)
48× 2,880–7,200 up to 58.9824 up to 7.03 9,600 (CAV)
52× 3,120–7,800 up to 63.8976 up to 7.62 10,400 (CAV)
56× 3,360–8,400 up to 68.8128 up to 8.20 11,200 (CAV)
72× 6,750–10,800 up to 88.4736 up to 10.5 2,000 (multi-beam)
-
http://en.wikipedia.org/wiki/Parallel_ATA
according to this ATA-33 is top speed of 33.3 mb/s
ok so from this information we can say
that the issue of not "Reaching full potential speed"
will only arise if u have a cd/dvd that is 32 speed or higher
anything less and there is no potential speed lost :)
assuming in this chart above that cd is the same as "dvd"
what speed were the original apple cd/dvds that shipped with the machine?
Standard Optical: 8X "Combo Drive" Standard Disk: None
Details: Apple reported that the 8X DVD-ROM/CD-RW Combo drive "reads DVDs at 8X, writes CD-R at 16X, writes CD-RW at 10X, and reads CDs at 32X". By custom order, it also could be configured with a second optical drive. Both optical drives use a EIDE (ATA-3) bus.
Unlike the "Quicksilver 2002" that it replaced, an internal Zip 250 drive was not available build-to-order.
ok so there we have it!
8x this is a non issue
after a quick check on ebay i cant see any parallel ata drives faster then 14x
and i did see some sata cd/dvd that were listed as 24x
not sure if there are any that go faster then 32x
ok so even if u were to buy a new 24x sata dvd reader/writer
and attach it to ATA-33 port via a Sata-Pata adapter
this would be more than enough bandwidth for the connection
and u would have a much faster dvd read speed
!
with potentially a speed jump frm 8x to 24x this is 3 times as fast
and maybe it is worth the 25$ for sata drive + adapter
http://www.tomshardware.com/reviews/DVD-Burner,2447.html
http://www.tomshardware.com/reviews/DVD-Burner,2447-2.html
http://www.tomshardware.com/reviews/DVD-Burner,2447-3.html
http://www.tomshardware.com/reviews/DVD-Burner,2447-4.html
http://www.tomshardware.com/reviews/DVD-Burner,2447-5.html
http://www.tomshardware.com/reviews/DVD-Burner,2447-6.html <-- chart here
http://www.tomshardware.com/reviews/DVD-Burner,2447-7.html <-- benchmarks
http://www.tomshardware.com/reviews/DVD-Burner,2447-8.html <-- more benchmarks
http://www.tomshardware.com/reviews/DVD-Burner,2447-9.html <-- even more benchmarks (lol)
http://www.tomshardware.com/reviews/DVD-Burner,2447-13.html <--- conclusion
according to this chart it lists cd-r at 48x and cd-rw at 32x!
so then perhaps there is a gain to having your cd/dvd attached to a ata-66 connection instead of ata-33!
-
so then perhaps there is a gain to having your cd/dvd attached to a ata-66 connection instead of ata-33!
May be...
But ATA-33 can theoretically feed a DVD writer up to 24x and a CD writer up to 220x !
I think you must avoid such writing speed :) , because the optical quality may be lower (i.e. the disc is less reflective)
http://en.wikipedia.org/wiki/CD_and_DVD_writing_speed