ATAPI CDRW which doesn't work

ATAPI CDRW which doesn't work

[patrick.mourlhon]

Hi,

I've never could make this CDRW ATAPI to work, if someone could
provide me any clue about the baby. I just said that people on the
kernel mailing list may care of its but. It looks like the baby didn't
even noticed. ;-)

kernel is 2.4.1, but never worked even before this release.
Never maintained speed.

Thanks in advance for any reply,

Patrick Mourlhon


----mount atapi cd writer outpu

Line:/mnt/home/pmo# mount /dev/hdb /cdrom
/dev/hdb: Input/output error
mount: block device /dev/hdb is write-protected, mounting read-only
/dev/hdb: Input/output error

mount: you must specify the filesystem type
Line:/mnt/home/pmo#


----/var/log/messages from start to the end of the previous mount command

Feb  3 22:08:25 Line kernel: hdb: irq timeout: status=0xd0 { Busy }
Feb  3 22:08:25 Line kernel: hdb: DMA disabled
Feb  3 22:08:55 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:08:55 Line kernel: hda: DMA disabled
Feb  3 22:08:55 Line kernel: ide0: reset: success
Feb  3 22:09:06 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:09:36 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:09:36 Line kernel: ide0: reset: success
Feb  3 22:09:47 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:09:47 Line kernel: end_request: I/O error, dev 03:40 (hdb), sector 2
Feb  3 22:09:48 Line kernel: hdb: status timeout: status=0x90 { Busy }
Feb  3 22:09:48 Line kernel: hdb: drive not ready for command
Feb  3 22:10:11 Line kernel: hdb: ATAPI reset complete
Feb  3 22:10:21 Line kernel: hdb: irq timeout: status=0xd0 { Busy }
Feb  3 22:10:51 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:10:51 Line kernel: ide0: reset: success
Feb  3 22:11:02 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:11:32 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:11:32 Line kernel: ide0: reset: success
Feb  3 22:11:42 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:11:42 Line kernel: end_request: I/O error, dev 03:40 (hdb), sector 2
Feb  3 22:11:43 Line kernel: hdb: status timeout: status=0x90 { Busy }
Feb  3 22:11:43 Line kernel: hdb: drive not ready for command
Feb  3 22:12:06 Line kernel: hdb: ATAPI reset complete
Feb  3 22:12:16 Line kernel: hdb: irq timeout: status=0xd0 { Busy }
Feb  3 22:12:46 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:12:46 Line kernel: ide0: reset: success
Feb  3 22:12:57 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:13:27 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:13:27 Line kernel: ide0: reset: success
Feb  3 22:13:37 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:13:37 Line kernel: end_request: I/O error, dev 03:40 (hdb), sector 0
Feb  3 22:13:37 Line kernel: FAT bread failed
Feb  3 22:13:38 Line kernel: hdb: status timeout: status=0x90 { Busy }
Feb  3 22:13:38 Line kernel: hdb: drive not ready for command
Feb  3 22:14:02 Line kernel: hdb: ATAPI reset complete
Feb  3 22:14:12 Line kernel: hdb: irq timeout: status=0xd0 { Busy }
Feb  3 22:14:42 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:14:42 Line kernel: ide0: reset: success
Feb  3 22:14:53 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:15:23 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:15:23 Line kernel: ide0: reset: success
Feb  3 22:15:33 Line kernel: hdb: irq timeout: status=0x90 { Busy }
Feb  3 22:15:33 Line kernel: end_request: I/O error, dev 03:40 (hdb), sector 0
Feb  3 22:15:33 Line kernel: FAT bread failed
Feb  3 22:15:35 Line kernel: hdb: status timeout: status=0x90 { Busy }
Feb  3 22:15:35 Line kernel: hdb: drive not ready for command
Feb  3 22:16:09 Line kernel: hdb: ATAPI reset timed-out, status=0x90
Feb  3 22:16:09 Line kernel: ide0: reset: success
Feb  3 22:16:12 Line kernel: hdb: packet command error: status=0x51 { DriveReady SeekComplete Error }
Feb  3 22:16:12 Line kernel: hdb: packet command error: error=0xb0
Feb  3 22:16:13 Line kernel: ATAPI device hdb:
Feb  3 22:16:13 Line kernel:   Error: Aborted command -- (Sense key=0x0b)
Feb  3 22:16:13 Line kernel:   (reserved error code) -- (asc=0x00, ascq=0x00)
Feb  3 22:16:13 Line kernel:   The failed "Prevent/Allow Medium Removal" packet command was:
Feb  3 22:16:13 Line kernel:   "1e 00 00 00 00 00 00 00 00 00 00 00 "


----cat /proc/interrupts

           CPU0
  0:     147746          XT-PIC  timer
  1:          2          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  4:          0          XT-PIC  serial
 10:          0          XT-PIC  usb-uhci
 12:       3622          XT-PIC  PCnet/PCI II 79C970A
 14:      11727          XT-PIC  ide0
 15:        127          XT-PIC  ide1
NMI:          0
LOC:          0
ERR:          0


----cat /proc/ioports

0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
02f8-02ff : serial(set)
0376-0376 : ide1
0378-037a : parport0
037b-037f : parport0
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(set)
0cf8-0cff : PCI conf1
5000-50ff : VIA Technologies, Inc. VT82C586B ACPI
d000-dfff : PCI Bus #01
  d000-d0ff : ATI Technologies Inc Rage XL AGP
e000-e00f : VIA Technologies, Inc. Bus Master IDE
  e000-e007 : ide0
  e008-e00f : ide1
e400-e41f : VIA Technologies, Inc. UHCI USB
  e400-e41f : usb-uhci
e800-e8ff : Tseng Labs Inc ET6000
ec00-ec1f : Advanced Micro Devices [AMD] 79c970 [PCnet LANCE]
  ec00-ec1f : PCnet/PCI II 79C970A


----/proc/ide/ide0/hdb

Line:/proc/ide/ide0/hdb# cat media
cdrom

Line:/proc/ide/ide0/hdb# cat model
R/RW 4x4x24

Line:/proc/ide/ide0/hdb# cat driver
ide-cdrom version 4.59

Line:/proc/ide/ide0/hdb# cat settings
name        value    min      max      mode
----        -----    ---      ---      ----
breada_readahead        4               0               127             rw
current_speed           34              0               69              rw
dsc_overlap             1               0               1               rw
file_readahead          0               0               2097151         rw
ide_scsi                0               0               1               rw
init_speed              12              0               69              rw
io_32bit                0               0               3               rw
keepsettings            0               0               1               rw
max_kb_per_request      128             1               127             rw
nice1                   1               0               1               rw
number                  1               0               3               rw
pio_mode                write-only      0               255             w
slow                    0               0               1               rw
unmaskirq               0               0               1               rw
using_dma               0               0               1               rw

Line:/proc/ide/ide0/hdb# cat identify
85c0 0000 0000 0000 0000 0000 0000 0000
0000 0000 3456 4f30 3934 3544 4530 3530
3232 2020 0000 0000 0000 1000 0000 2031
2e30 3400 0000 522f 5257 2034 7834 7832
3420 2020 2020 2020 2020 2020 2020 2020
2020 2020 2020 2020 2020 2020 2020 0000
0000 0b00 0000 0200 0200 0002 0000 0000
0000 0000 0000 0000 0000 0000 0007 0407
0003 0078 0078 0078 0078 0000 0000 0000
0000 0004 0009 0000 0000 0000 0000 0000
...

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Re: ATAPI CDRW which doesn't work

[Marko Kreen]

On Sat, Feb 03, 2001 at 11:05:44PM +0100, patrick.mourlhon@wanadoo.fr wrote:
> Hi,
> 
> I've never could make this CDRW ATAPI to work, if someone could
> provide me any clue about the baby. I just said that people on the
> kernel mailing list may care of its but. It looks like the baby didn't
> even noticed. ;-)

Compile in options 'SCSI generic', 'SCSI cdrom and 'SCSI
emulation support' then add 'hdb=scsi' to kernel parameters.

Now you can use it as SCSI cdrom, and cd-writers recognize it
too.  Eg. for cdrecord you should probably put 'dev=0,0,0' to
command line (I assume you have no other SCSI controller).


-- 
marko

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Re: ATAPI CDRW which doesn't work

[Joachim 'roh' Steiger]

On Sun, 4 Feb 2001, Marko Kreen wrote:

> On Sat, Feb 03, 2001 at 11:05:44PM +0100, patrick.mourlhon@wanadoo.fr wrote:
> Compile in options 'SCSI generic', 'SCSI cdrom and 'SCSI
> emulation support' then add 'hdb=scsi' to kernel parameters.
is there someone working on direct support for Atapi-cdrw this time?
i would like to use a clean solution and am ready to help testing such
stuff (if existing) with my yamaha atapi-cdrw connected to an asus a7v

regards

roh

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AW: ATAPI CDRW which doesn't work -> devfs problems

[Friedrich Lindenberg]

 Hi
 I was trying to burn cds under linux-2.4.1 with 
 devFS enabled. But x-cd-roast (and also cdrecord)
 do not find any scsi drives. I guess they have been
 renamed or something like that, I cannot find them 
 in /dev, nor anywhere in /dev/scsi ...
 Oh, and could anybody tell me, how I stop RH7
 creating /dev/lp* every time I boot ? I don't 
 use devices attached to lp* ....

   thanks & greetings,
    Friedrich 

 
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AW: ATAPI CDRW which doesn't work -> devfs problems part2

[Friedrich Lindenberg]

-----Ursprüngliche Nachricht-----
Von: linux-kernel-owner@vger.kernel.org
[mailto:linux-kernel-owner@vger.kernel.org]Im Auftrag von Friedrich
Lindenberg
Gesendet: Sonntag, 4. Februar 2001 11:36
An: linux-kernel@vger.kernel.org
Betreff: AW: ATAPI CDRW which doesn't work -> devfs problems



 Hi
 I was trying to burn cds under linux-2.4.1 with
 devFS enabled. But x-cd-roast (and also cdrecord)
 do not find any scsi drives.
    I AM USING hdd=ide-scsi && hdc=ide-scsi !!!

 I guess they have been
 renamed or something like that, I cannot find them
 in /dev, nor anywhere in /dev/scsi ...
 Oh, and could anybody tell me, how I stop RH7
 creating /dev/lp* every time I boot ? I don't
 use devices attached to lp* ....

   thanks & greetings,
    Friedrich


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Re: ATAPI CDRW which doesn't work

[Marko Kreen]

On Sun, Feb 04, 2001 at 11:16:16AM +0100, Joachim 'roh' Steiger wrote:
> On Sun, 4 Feb 2001, Marko Kreen wrote:
> > Compile in options 'SCSI generic', 'SCSI cdrom and 'SCSI
> > emulation support' then add 'hdb=scsi' to kernel parameters.
> is there someone working on direct support for Atapi-cdrw this time?
> i would like to use a clean solution and am ready to help testing such
> stuff (if existing) with my yamaha atapi-cdrw connected to an asus a7v

I guess the kernel does not care, the problem is the user-space
utilities want to spek SCSI.  You could contact the developers
of cdwriter or cdrecord I guess.

-- 
marko

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Re: ATAPI CDRW which doesn't work

[patrick.mourlhon]

> > I've got those kind of message now :
> > 
> > Feb  4 07:18:35 Line kernel: scsi : aborting command due to timeout : pid 0, scsi0, channel 0, id 0, lun 0 Read (10) 00 00 00 00 2e 00 00 01 00 
> 
> If this is a correct ISO9660 cd you should not see those
> messages.  It is either hardware problem (eg IDE cable is badly
> conencted or CDRW is broken/dusty) or this CD is simply
> scratched.  Does it work with another CD?
> 
> Also try to put it on separate IDE channel than your main HD.

Cable looks ok, removed and reinstalled, used it before with 
a second hard disk. CDRW may be broken. don't know, but at
least nothing appear broken all around the device.
CD was read with an other CDROM reader.
Never seen CDRW working reliably till now. But never used it
through Windows, don't have it since 4 years. I might at least
check if it could work on Windows.

Whatever thanks a lot for your time, was greatly appreciated,

patrick
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Re: ATAPI CDRW which doesn't work

[Jens Axboe]

On Sat, Feb 03 2001, patrick.mourlhon@wanadoo.fr wrote:
> Feb  3 22:08:25 Line kernel: hdb: irq timeout: status=0xd0 { Busy }
> Feb  3 22:08:25 Line kernel: hdb: DMA disabled
> Feb  3 22:08:55 Line kernel: hdb: ATAPI reset timed-out, status=0x90
> Feb  3 22:08:55 Line kernel: hda: DMA disabled

Try disabling DMA on the drive before accessing it. 

-- 
Jens Axboe

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Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Rogerio Brito]

On Feb 05 2001, Jens Axboe wrote:
> On Sat, Feb 03 2001, patrick.mourlhon@wanadoo.fr wrote:
> > Feb  3 22:08:25 Line kernel: hdb: irq timeout: status=0xd0 { Busy }
> > Feb  3 22:08:25 Line kernel: hdb: DMA disabled
> > Feb  3 22:08:55 Line kernel: hdb: ATAPI reset timed-out, status=0x90
> > Feb  3 22:08:55 Line kernel: hda: DMA disabled
> 
> Try disabling DMA on the drive before accessing it. 

	Well, this has nothing to do with the above, but is there any
	utility or /proc entry that lets me say to my CD drive that it
	should not work at full speed?

	Basically, some drives make way too much noise when they're
	operating at full speed. When I'd like to listen to some MP3s
	from a burned CD-R, what I'm currently doing is copying the
	files that I want to /tmp and listening from there, but this
	is obviously a dirty solution. :-(


	Thanks in advance for any hints, Roger...

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  Rogerio Brito - rbrito@iname.com - http://www.ime.usp.br/~rbrito/
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Ingo Oeser]

On Mon, Feb 05, 2001 at 01:34:24AM -0200, Rogerio Brito wrote:
> 	Well, this has nothing to do with the above, but is there any
> 	utility or /proc entry that lets me say to my CD drive that it
> 	should not work at full speed?

/proc/ide/hdX/settings ? The (current,init)_speed settings there?

Give it a try at least ;-)

Regards

Ingo Oeser
-- 
10.+11.03.2001 - 3. Chemnitzer LinuxTag <http://www.tu-chemnitz.de/linux/tag>
         <<<<<<<<<<<<       come and join the fun       >>>>>>>>>>>>
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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Guest section DW]

> On Mon, Feb 05, 2001 at 01:34:24AM -0200, Rogerio Brito wrote:
> > 	Well, this has nothing to do with the above, but is there any
> > 	utility or /proc entry that lets me say to my CD drive that it
> > 	should not work at full speed?

I missed the original post, but there is a mount flag "-o speed="
for precisely this purpose.
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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Jens Axboe]

On Mon, Feb 05 2001, Guest section DW wrote:
> I missed the original post, but there is a mount flag "-o speed="
> for precisely this purpose.

Hah, this I did not know. Checking the util-linux source, it might
be a really good idea to not about if setting the speed fails.
This will happen quite often on cd-r/w or dvd drives.

-- 
Jens Axboe

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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Andre Hedrick]

On Mon, 5 Feb 2001, Ingo Oeser wrote:

> On Mon, Feb 05, 2001 at 01:34:24AM -0200, Rogerio Brito wrote:
> > 	Well, this has nothing to do with the above, but is there any
> > 	utility or /proc entry that lets me say to my CD drive that it
> > 	should not work at full speed?
> 
> /proc/ide/hdX/settings ? The (current,init)_speed settings there?
> 
> Give it a try at least ;-)

That is the ATA transfer rate between the device and the host only.

Andre Hedrick
Linux ATA Development
ASL Kernel Development
-----------------------------------------------------------------------------
ASL, Inc.                                     Toll free: 1-877-ASL-3535
1757 Houret Court                             Fax: 1-408-941-2071
Milpitas, CA 95035                            Web: www.aslab.com

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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Jens Axboe]

On Mon, Feb 05 2001, Rogerio Brito wrote:
> 	Well, this has nothing to do with the above, but is there any
> 	utility or /proc entry that lets me say to my CD drive that it
> 	should not work at full speed?
> 
> 	Basically, some drives make way too much noise when they're
> 	operating at full speed. When I'd like to listen to some MP3s
> 	from a burned CD-R, what I'm currently doing is copying the
> 	files that I want to /tmp and listening from there, but this
> 	is obviously a dirty solution. :-(

	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);

-- 
Jens Axboe

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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Rogerio Brito]

On Feb 05 2001, Jens Axboe wrote:
> 	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);

	I'd like to thank everybody that replied either on the list
	and privately. I didn't know that I could just use the /proc
	entries to change the IDE driver speed with a simple:

	echo current_speed:4 > /proc/ide/hdc/settings

	(Thanks Mark for this).

	I'd also like to thank Andries about the tip on the mount
	option. I didn't find anything in the util-linux (mount)
	manpage before I asked (I'm using Debian potato's util-linux
	2.10q-1).

	The option that I chose was to cook a little proggie to call
	the ioctl to set the speed. This is the most flexible solution
	(as it doesn't involve messing with fstab or being root to
	pass the mount option to mount). Thanks, Jens!

	Thank you all very, very much for the amazing (and fast) help!


	[]s, Roger...

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  Rogerio Brito - rbrito@iname.com - http://www.ime.usp.br/~rbrito/
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Andre Hedrick]

On Mon, 5 Feb 2001, Rogerio Brito wrote:

> On Feb 05 2001, Jens Axboe wrote:
> > 	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);
> 
> 	I'd like to thank everybody that replied either on the list
> 	and privately. I didn't know that I could just use the /proc
> 	entries to change the IDE driver speed with a simple:
> 
> 	echo current_speed:4 > /proc/ide/hdc/settings

You can not it has nothing to do with the speed of the device but the
transfer rate between the host and the device.

Andre Hedrick
Linux ATA Development
ASL Kernel Development
-----------------------------------------------------------------------------
ASL, Inc.                                     Toll free: 1-877-ASL-3535
1757 Houret Court                             Fax: 1-408-941-2071
Milpitas, CA 95035                            Web: www.aslab.com

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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Pavel Machek]

Hi!

> > 	Well, this has nothing to do with the above, but is there any
> > 	utility or /proc entry that lets me say to my CD drive that it
> > 	should not work at full speed?
> > 
> > 	Basically, some drives make way too much noise when they're
> > 	operating at full speed. When I'd like to listen to some MP3s
> > 	from a burned CD-R, what I'm currently doing is copying the
> > 	files that I want to /tmp and listening from there, but this
> > 	is obviously a dirty solution. :-(
> 
> 	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);

Does this actually work? I helped my friend with partly broken cdrom
(worked only at low speeds) and it did not have much effect. It did
not make my cdrom quiet, either, AFAI can remember.
								Pavel
-- 
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Jens Axboe]

On Sat, Feb 10 2001, Pavel Machek wrote:
> > 	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);
> 
> Does this actually work? I helped my friend with partly broken cdrom
> (worked only at low speeds) and it did not have much effect. It did
> not make my cdrom quiet, either, AFAI can remember.

It's no news that vendors only implement what they want to. New
cd-r/w and dvd drives are not required to implement this command,
so it may not work there either.

-- 
Jens Axboe

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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Alan Olsen]

On Sun, 11 Feb 2001, Jens Axboe wrote:

> On Sat, Feb 10 2001, Pavel Machek wrote:
> > > 	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);
> > 
> > Does this actually work? I helped my friend with partly broken cdrom
> > (worked only at low speeds) and it did not have much effect. It did
> > not make my cdrom quiet, either, AFAI can remember.
> 
> It's no news that vendors only implement what they want to. New
> cd-r/w and dvd drives are not required to implement this command,
> so it may not work there either.

Take a look at the code for cdparanoia or one of the other MP3 ripping
programms. Slowing down the drive is a standard feature for that type of
program.  (Reduces errors when pulling audio tracks off the disc.)

alan@ctrl-alt-del.com | Note to AOL users: for a quick shortcut to reply
Alan Olsen            | to my mail, just hit the ctrl, alt and del keys.
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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Jens Axboe]

On Sun, Feb 11 2001, Alan Olsen wrote:
> > It's no news that vendors only implement what they want to. New
> > cd-r/w and dvd drives are not required to implement this command,
> > so it may not work there either.
> 
> Take a look at the code for cdparanoia or one of the other MP3 ripping
> programms. Slowing down the drive is a standard feature for that type of
> program.  (Reduces errors when pulling audio tracks off the disc.)

One would think that you have taken a look at the cdparanoia
source before posting something like this. Guess what it does to
control speed? Reread my message, you totally missed the point.

-- 
Jens Axboe

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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Alan Olsen]

Sorry. it was late when I answered that.  (Either that or no ocffe, not
certain which.)

On Sun, 11 Feb 2001, Jens Axboe wrote:

> On Sun, Feb 11 2001, Alan Olsen wrote:
> > > It's no news that vendors only implement what they want to. New
> > > cd-r/w and dvd drives are not required to implement this command,
> > > so it may not work there either.
> > 
> > Take a look at the code for cdparanoia or one of the other MP3 ripping
> > programms. Slowing down the drive is a standard feature for that type of
> > program.  (Reduces errors when pulling audio tracks off the disc.)
> 
> One would think that you have taken a look at the cdparanoia
> source before posting something like this. Guess what it does to
> control speed? Reread my message, you totally missed the point.
> 
> -- 
> Jens Axboe
> 
> 

alan@ctrl-alt-del.com | Note to AOL users: for a quick shortcut to reply
Alan Olsen            | to my mail, just hit the ctrl, alt and del keys.
    "In the future, everything will have its 15 minutes of blame."

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Re: Slowing down CDROM drives (was: Re: ATAPI CDRW which doesn't work)

[Rogerio Brito]

On Feb 10 2001, Pavel Machek wrote:
> Hi!
> 
> > 	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);
> 
> Does this actually work? I helped my friend with partly broken cdrom
> (worked only at low speeds) and it did not have much effect. It did
> not make my cdrom quiet, either, AFAI can remember.

	Well, I wrote a little program that just makes this call that
	Jens told me about and it worked perfectly with my hardware --
	using my CD-ROM drive at speed 1, 2 or 4, it works quietly and
	I can listen to MP3s at volumes that I couldn't earlier.

	OTOH, it seems that a paradox is happening: this very same
	drive has some problems (not always reproducible) reading some
	CD-RW discs when it operates at very slow speeds. In this
	case, the best that I can do is to let the drive accelerate as
	much as it wants and then it works ok.

	BTW, Jens, what is the way to set the drive back to its
	maximum speed, without limits? Where could I read more about
	the subject (that is, this and other ioctl's) without annoying
	you? I'm a moderately competent C programmer (only
	moderately), but I know *nothing* about the kernel.


	[]s, Roger...

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  Rogerio Brito - rbrito@iname.com - http://www.ime.usp.br/~rbrito/
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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Re: Slowing down CDROM drives

[Ion Badulescu]

On Sun, 11 Feb 2001 16:20:47 -0200, Rogerio Brito <rbrito@iname.com> wrote:

>> > 	ioctl(cd_fd, CDROM_SELECT_SPEED, speed);

Yes: pass 0 as the speed, in the ioctl() above.

Ion

-- 
  It is better to keep your mouth shut and be thought a fool,
            than to open it and remove all doubt.
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