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Thread: Drive Read Cache: weird thing

  1. #1
    dBpoweramp Enthusiast
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    Drive Read Cache: weird thing

    Hi,

    I used dbpoweramp reference 12.1 and 12.2 trial versions some time ago and when detecting in "secure options" the Drive Read Cache, dbpoweramp detected a cache in both versions.

    Now some time later, I installed dbpoweramp reference 12.3 trial and when detecting the drive read cache on exactly the same drive, computer and operating system (nothing has changed to the configuration of the computer), dbpoweramp says the drive doesn't have a cache at all.

    So now my question is: how is it possible the older versions detect a cache and the new version doesn't detect a cache at all?

    ps: the drive is a plextor plexwriter premium

    thx in advance

  2. #2
    dBpoweramp Enthusiast Tigerman's Avatar
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    Re: Drive Read Cache: weird thing

    In the beginning I had a simular problem with my plextor 760A.DBpoweramp said it didnīt cache.
    The problem was an old version of Deamon virtual drive. The SPTD-driver was preventing a correct reading.
    Thereīs a new SPTD-driver without this problem.
    Donīt know if this is your problem also, Iīm just pointing to a possible cause.

  3. #3
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    Re: Drive Read Cache: weird thing

    hi,

    I saw I can choose SPTD or ASPI driver. Can somebody tell me which is the default choice for dbpoweramp? Now SPTD is chosen .

    thx

  4. #4
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    Re: Drive Read Cache: weird thing

    SPTD is default.

  5. #5
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    Re: Drive Read Cache: weird thing

    Quote Originally Posted by Tigerman
    In the beginning I had a simular problem with my plextor 760A.DBpoweramp said it didnīt cache.
    The problem was an old version of Deamon virtual drive. The SPTD-driver was preventing a correct reading.
    Thereīs a new SPTD-driver without this problem.
    Donīt know if this is your problem also, Iīm just pointing to a possible cause.
    But I don't understand what Deamon tools has to do with dbpoweramp.
    Can somebody explain please?

    thx

  6. #6
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    Re: Drive Read Cache: weird thing

    Quote Originally Posted by Dude
    But I don't understand what Deamon tools has to do with dbpoweramp.
    Can somebody explain please?
    Daemon tools, just like most virtual optical drive packages, installs "filter drivers" into the driver stack so as to be able to intercept low-level device calls in such a way as to present virtual devices on the system. The problem is that sometimes these intercepts are still executed on real devices and, in addition, sometimes the intercepts don't properly pass on the original call (or the device's returned data) correctly, causing problems. In addition, the intercepts can adversely effect transactions that are timing sensitive, such as optical drive feature testing (cache/c2), etc.

    -brendan

  7. #7
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    Re: Drive Read Cache: weird thing

    Quote Originally Posted by bhoar
    Daemon tools, just like most virtual optical drive packages, installs "filter drivers" into the driver stack so as to be able to intercept low-level device calls in such a way as to present virtual devices on the system. The problem is that sometimes these intercepts are still executed on real devices and, in addition, sometimes the intercepts don't properly pass on the original call (or the device's returned data) correctly, causing problems. In addition, the intercepts can adversely effect transactions that are timing sensitive, such as optical drive feature testing (cache/c2), etc.

    -brendan
    Ok, I understand it now. But when I used versions 12.1 and 12.2, the same deamon tools version was installed and it never was uninstalled.
    So why does version 12.3 has problems with it and the older version don't?

  8. #8
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    Re: Drive Read Cache: weird thing

    The cache detection routines have not changed from R12.1 to R12.3

  9. #9
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    Re: Drive Read Cache: weird thing

    Quote Originally Posted by Spoon
    The cache detection routines have not changed from R12.1 to R12.3
    Do you have an idea what could be the problem, because whatever cd I use, it keeps telling there's no cache , while the older versions detected a cache.

    thx

  10. #10
    dBpoweramp Enthusiast Tigerman's Avatar
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    Re: Drive Read Cache: weird thing

    Have you tried to replace the SPTD-driver?
    You can disable it first to see if it is the cause, see second question at this page: http://www.duplexsecure.com/faq/

  11. #11
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    Re: Drive Read Cache: weird thing

    Even if an audio player was playing in the background, that could cause the detection to fail, it is that critical on timing.

  12. #12
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    Re: Drive Read Cache: weird thing

    Quote Originally Posted by Spoon
    Even if an audio player was playing in the background, that could cause the detection to fail, it is that critical on timing.
    But there is nothing running at all (no audio player, ...) in the background.
    There is still no cache detected. Any other things I can try?

  13. #13
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    Re: Drive Read Cache: weird thing

    Quote Originally Posted by Tigerman
    Have you tried to replace the SPTD-driver?
    How can I replace this driver? I don't know anything about how to do this.

    Can you tell me if the SPTD-driver is installed on my pc when installing dbpoweramp or what program has installed this driver on my pc?
    I now reformatted my whole hard drive and reinstalled windows, but the SPTD driver is found in dbpoweramp without installing *any* other application on my pc and still no cache is detected in dbpoweramp. So is the SPTD-driver a part of windows itself then?

    thx
    Last edited by Dude; 01-04-2008 at 07:18 AM.

  14. #14
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    Re: Drive Read Cache: weird thing

    The conversation about SPTD might be a red herring, but I though it might be useful to clarify a few things.

    1. SPTI and SPTD are two different things. The first, SPTI, is part of the windows calling interface, and the contemporary "best" way to directly interact with devices at a low level. The latter, SPTD, is a 3rd party interface installed by several different products, but not by dbpoweramp. It is the latter that can sometimes cause problems with ripping software.

    2. The link in a post above to the duplexsecure site gives instructions on how to either disable or uninstall SPTD. Follow these if you suspect STPD is installed and suspect it might be interfering with device operations in non-STPD applications. Note that this might break the software that uses STPD (if installed) such as virtual drive, dvd ripping and game-disc freeing software.

    -brendan

  15. #15
    dBpoweramp Enthusiast Tigerman's Avatar
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    Re: Drive Read Cache: weird thing

    Sometimes I wonder why I write a second line in a post. It seems only the first line is read...

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