CDRW and UDMA,

[Artifx]

Can anyone tell me if there is such a thing as a CDRW drives that supports UDMA? can you all suggest a few? Also are there any CDRW media that you can write to over 4X?

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To Be or not to Be?!!!


TBird 900mhz
Abit KT7A-Raid
256 mb Crucial PC133 Cas2
ATI AIW Radeon
SBLive X-Gamer
10gb Maxtor HD ATA 66
40gb IBM HD ATA 100
Yamaha 8824 CDRW
ACER 16X DVD
USR 5610A Modem
Netgear NIC

[sven256]

the yamaha crw2100 surports it and i thind you can def write cdrw at 8x these days even 10

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[slipe]

PIO4 is 16Mb/sec and faster than any burner made. It makes no performance difference which you have. On any MB made in the past few years a PIO4 drive will not slow a UDMA/ATA 66 or 100 HD on the same channel. There are important considerations to make in the purchase of a burner and I don’t think that whether it is PIO or UDMA is significant.

Just look at the CD-RW labels in the store. Many are 10X now.

[Artifx]

Hey Slipe I see what you are saying, but isn't a DMA transfer supposed to use less CPU than PIO4 transfers? Does it really not affect UDMA 66/100 speed? I guess whether the drive can transfer at a max burst rate of 16mb/sec is not really the point... just nice to know the technology is there? It would hopefully help reduce buffer underruns..

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To Be or not to Be?!!!


TBird 900mhz
Abit KT7A-Raid
256 mb Crucial PC133 Cas2
ATI AIW Radeon
SBLive X-Gamer
10gb Maxtor HD ATA 66
40gb IBM HD ATA 100
Yamaha 8824 CDRW
ACER 16X DVD
USR 5610A Modem
Netgear NIC

[wrathchild_67]

Well DMA stands for Direct Memory Access, which means the system memory will have a direct interface with the IDE device instead of interfacing through the cpu; and thus less cpu cycles are eaten...

I leave DMA enabled on my LiteOn 12x10x32 all the time and I never have any problems. And the transfer rates are much faster with DMA enabled.

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Sir, are you classified as human? Negative, I am a meat popsicle.

[NoBoB]

The read speeds may indeed be higher, but the drive won't write any faster.

The transfer demands placed on a properly functioning system by the up to 2400k/sec (at 16x) write speeds shouldn't be enough that DMA would be much of a factor one way or the other.

[wrathchild_67]

I never said it would write any faster- I have yet to see an IDE CDRW that burns CD's any slower in PIO-4 mode compared to DMA mode. So if you use your burner just for burning, then PIO is alright. But less cpu utilization is always good too... Go with DMA if the burner supports it.

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Sir, are you classified as human? Negative, I am a meat popsicle.

[BartY]

The write speeds, and even the read speeds of most CD-ROM's and CDRW's don't really need UDMA. I have a Ultra/Narrow SCSI CDRW (20MB/s), and the drive itself isn't even capable reaching those kinds of transfer speeds.

Your faster CD-ROM's may benefit from enabling DMA, but I don't think you'll see any difference on a burner.

Bart

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Abit BE6-II
700MHz Pentium III@933Mhz
256MB Mushkin PC133
nVidia GeForce2 GTS 32MB
WD Ultra2 10k rpm 9.1GB
Generic 52x CD-ROM
Tekram DC-390U2W SCSI
Yamaha CRW8424S CD-RW SCSI-2

[slipe]

You can have DMA on PIO4 – just not UDMA. The DMA check box is available in device manager. The Plextor 1210A has an excellent track record as a PIO4 device. There is an unauthorized jumper hack that brings it to UDMA but most owners are very happy at PIO4.

I’m not saying UDMA isn’t nice but it doesn’t seem to be necessary in a quality burner. As far as it slowing a HD you can have a look at these tests of a 7200 RPM UDMA 66 Maxtor with and without a PIO4 CD-ROM on the same channel: http://www.anandtech.com/showdoc.html?i=1237&p=25