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  #1  
Old 1st May 2012, 08:23 PM
tashirosgt Offline
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My 40-wire SATA DVD-RW & FC16 LiveCd

According the FC 16 LiveCd, my SATA DVD-RW is set to UDMA/33 because it has a 40-wire cable.

The output of dmesg:

Quote:
ata5.00: ATAPI: TSSTcorp CDDVDW SH-S223Q, SB03, max UDMA/100
ata5.00: limited to UDMA/33 due to 40-wire cable
ata5.00: configured for UDMA/33
Of course, the DVD-RW is on a SATA controller and connected by a SATA cable. The controller is set to the "IDE" mode (since, as I mentioned in another thread, DVD-RWs apparently don't work on controllers set to the better AHCI mode).

Is it the normal for SATA DVD-RWs to be set to the UDMA/33 mode? Would it actually help their performance if they were set to UDMA/100?
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  #2  
Old 1st May 2012, 11:08 PM
sonoran Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

Quote:
Originally Posted by tashirosgt View Post
Is it the normal for SATA DVD-RWs to be set to the UDMA/33 mode? Would it actually help their performance if they were set to UDMA/100?
My Sony Optiarc drive gets configured to UDMA/100, in dmesg.log:
Quote:
ata5.00: ATAPI: Optiarc DVD RW AD-7280S, 1.01, max UDMA/100
ata5.00: configured for UDMA/100
Interestingly, the wikipedia entry on AHCI has a link to this Fedora Forum thread:
http://fedoraforum.org/forum/showthread.php?t=202286

Note that my BIOS has SATA configuration set to "Native IDE", not "AHCI" - it came that way and I haven't messed with it. SATA HD and DVD read-write speeds are both pretty good.
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  #3  
Old 2nd May 2012, 01:28 AM
DBelton Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

Same thing here. Mine gets configured to UDMA/100

Code:
[    0.651323] ata3: SATA max UDMA/133 cmd 0xd080 ctl 0xd000 bmdma 0xc800 irq 19
[    0.651386] ata4: SATA max UDMA/133 cmd 0xcc00 ctl 0xc880 bmdma 0xc808 irq 19

[    0.822378] ata4.01: NODEV after polling detection
[    0.841254] ata4.00: ATAPI: TSSTcorp CDW/DVD TS-H493A, CD07, max UDMA/100
[    0.863152] ata4.00: configured for UDMA/100
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  #4  
Old 2nd May 2012, 03:53 AM
tashirosgt Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

Same thing here. My OptiArch AD-7240 S gets configured at UDMA/100

That's under FC 12.

Both on this system and the one mentioned in the OP the SATA controller for the DVD-RW is set to IDE mode.

Does anyone have a Samsung SH-S223 that got configured to UDMA 100?
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Last edited by tashirosgt; 2nd May 2012 at 03:58 AM.
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  #5  
Old 2nd May 2012, 09:22 AM
george_toolan Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

Quote:
Would it actually help their performance if they were set to UDMA/100?
Not at all. Your burner isn't faster than 33 MB/sec ;-)

If you can you should enable AHCI in your BIOS setup, because advanced sata features like NCQ don't work in ide compatibility mode.
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  #6  
Old 2nd May 2012, 03:56 PM
tashirosgt Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

Quote:
Originally Posted by george_toolan View Post
If you can you should enable AHCI in your BIOS setup, because advanced sata features like NCQ don't work in ide compatibility mode.
I 've enabled it on the SATA controller for the hard drive, but the Samsung DVD-RW won't work on a controller in the AHCI mode. Anyone have a DVD-RW working in the AHCI mode?
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  #7  
Old 2nd May 2012, 05:27 PM
PabloTwo Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

Quote:
Originally Posted by tashirosgt
Anyone have a DVD-RW working in the AHCI mode?
Yes, I do. My BIOS let's me choose either IDE, AHCI or RAID mode, which affects both SATA controllers (SATAII and SATA3). I have AHCI set.
Code:
[    0.882465] ata4: SATA max UDMA/133 abar m2048@0xfa205000 port 0xfa205280 irq 45
[    1.187068] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    1.188774] ata4.00: ATAPI: ASUS    DRW-24B1ST, 1.01, max UDMA/100
[    1.189494] ata4.00: configured for UDMA/100
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  #8  
Old 2nd May 2012, 10:32 PM
tashirosgt Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

Quote:
Originally Posted by PabloTwo View Post
Yes, I do.
Tell me the model of that DVD-RW and I'll put it on my shopping list! I couldn't tell from your output.
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  #9  
Old 3rd May 2012, 01:34 AM
DBelton Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

According to the output he posted above, it appears this is the drive he's got:

http://www.newegg.com/Product/Produc...82E16827135204

An Asus DRW-24B1ST
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  #10  
Old 3rd May 2012, 02:11 AM
sonoran Offline
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Re: My 40-wire SATA DVD-RW & FC16 LiveCd

On george_toolan's recommendation I switched my BIOS to AHCI - so far so good. Everything works.
dmesg:
Quote:
[ 0.927138] ahci 0000:00:11.0: version 3.0
[ 0.927222] ahci 0000:00:11.0: irq 42 for MSI/MSI-X
[ 0.927319] ahci 0000:00:11.0: AHCI 0001.0100 32 slots 4 ports 3 Gbps 0xf impl SATA mode
[ 0.927322] ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part ccc
The only obvious change is a message at the start of boot: "AHCI Drive Init" followed by about a 3 second pause, then a list of my two HDs and the DVD drive. The Sony DVD is configured as before, UDMA/100.

Subjectively (no actual testing), it appears the 3 GKrellM meters for my cpu cores are registering noticeably less activity when playing a DVD with vlc, maxing at 2-4% rather than the 6-7% they used to jump to.

Those few seconds of additional boot time would be a small price to pay for greater overall system efficiency (we watch a lot of movies). Thanks tash & george, et al.

(Drive is a Sony Optiarc DVD RW AD-7280S, about $20 US including shipping from Newegg)
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