Re: [Comm] CD-RW: what best - SCSI or ATAPI?

[Maxim Britov <udjinrg@forenet.by>]

[-- Attachment #1: Type: text/plain, Size: 2514 bytes --]

> > [...]
> > 
> > >Статус фичи:
> > >
> > >        Linux-2.4.xx includes a CDROM Packet interface in the
> > >        IDE CD driver. For this driver libscg now includes
> > >        support in pre-alpha status.
> > >        ^^^^^^^^^^^^^^^^^^^^^^^^^
> > [...]
> > 
> > А в ядре 2.6 ide-scsi сломан, и чинить его не собираются, т.к. "пишите
> > через АТАПИ, новый cdrecord это позволяет". См.
> > http://www.codemonkey.org.uk/post-halloween-2.5.txt
> 
> Поддержка ATAPI в 2.4 и 2.6 - это разные вещи; читайте README.ATAPI
> внимательнее (там говорится про >=2.5.45).  При использовании ATAPI в
> 2.4.x DMA не работает; в 2.6 - работает (и даже лучше, чем через ide-scsi,
> где DMA работает только при размере сектора 2048, т.е. только при записи
> дисков с данными, но не в режиме Audio или RAW).

И делать dev=/dev/hdc вместо dev=ATAPI

README.ATAPI:
 -       Starting with Linux-2.5.45, there is a new experimental
                ATAPI interface initiated by Linus Torvalds. Unfortunately,
                this interface does not fit well into the rest of the Linux
                SCSI kernel transport naming scheme. Cdrecord allows to
                use this interface by calling e.g. cdrecord dev=/dev/hdc ...
                but it is not officially supported until it has been
                integrated into the dev=bus,target,lun nming scheme.
                                                                                
        All Linux ATAPI transport implementations do not support DMA.
        Current execptions are:
                                                                                
        -       ide-scsi with block size 2048 and if DMA has been enabled
                                                                                
        -       The new experimental ATAPI interface starting with Linux-2.5.45
                allows DMA if DMA has been enabled and the sector size is a
                multiple of 4. This allows to use DMA for audio CDs and
                when writing any type of CD in RAW mode.
                                                                                
        RAW mode is needed for many new and cheap drives that have bugs when
        writing in cooked mode. If there is no DMA, you cannot write faster
        than approx 16x.

-- 
MaxBritov

GnuPG KeyID 0x4580A6D66F3DB1FB Keyserver hkp://keyserver.kjsl.com
Fingerprint: 4059 B5C5 8985 5A47 8F5A 8623 4580 A6D6 6F3D B1FB

[-- Attachment #2: Type: application/pgp-signature, Size: 485 bytes --]