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    Robert Manzano
    Jun 15, 2021

    Files with 0kb

    in Device Support

    Hi all,

    After months of using AM for fieldwork I've noticed some of them create audio files with 0kb. Usually they do it (but not all of them do it) when battery voltage is approaching the 3'6V. But a few do it regardless the battery level.

    Have anyone come across this issue and the reason of it?


    Many thanks,


    63 comments
    0
    63 Comments

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    M
    Michael Bruno
    Jun 12

    Alex, entao... no cartão SANDISK EXTREME nao aprece nada gravado. Como informei, nem 0 KB é gravado

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    Michael Bruno
    Jun 12
    Replying to

    @Alex Rogers mas eu acho que não é o aparelho, por que se fosse ele nao gravaria nada no outro cartao (Sandisk ultra). Ele tem pilhas instaladas, eu vou trocar novamente as pilhas e ve o que acontece.


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    Michael Bruno
    Jun 12
    Replying to

    @Alex Rogers eu usei recentemente o aparelho usando o antigo cartão, e gravou normalmente nos primeiros 15 minutos.

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    A
    Alex Rogers
    Jun 12
    Replying to

    @Michael Bruno Yes, I don't really understand what is happening here. Recording a small number of files and then writing 0KB files is generally a sign that the SD card is full (often with hidden files that don't show up on your computer) and needs reformatting. Is the content of the files that the Sandisk Ultra records okay? If you record your voice, does it appear in the recordings correctly? I would try reformatting the Sandisk Ultra card in either FAT32 or exFAT - the opposite of whichever it is already.

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    M
    Michael Bruno
    Jun 12

    Alex, entao... no cartão SANDISK EXTREME nao aprece nada gravado. Como informei, nem 0 KB é gravado

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    Michael Bruno
    Jun 12

    Outra coisa, gravei outros arquivos do meu computador no cartão, e gravou normalmente

    Like

    A
    Alex Rogers
    Jun 12

    Did you reformat both the cards to exFAT or FAT32? Both should work.

    Like
    M
    Michael Bruno
    Jun 12
    Replying to

    Eu configurei para exfat. Porem o cartão antigo (Sandisk ultra) gravou 15 minutos e apos este tempo fica 0kb. Já o cartão novo (Sandisk extreme) não grava obsolutamente nada. Nao aparece nem 0kb. Não aparece no cartão nem o arquivo CONFIG

    Like

    A
    Alex Rogers
    Jun 12
    Replying to

    @Michael Bruno Can you describe what the LED do in this case? A long flash of both red and green LED indicates an SD card write error. For the SD card that is recording, do the files sound okay? If you record your voice, can you hear your voice in the recordings clearly with no interference?

    Like

    A
    Alex Rogers
    Jun 12
    Replying to

    Can you also post one of the files here so I can read the WAV header comments.

    Like

    A
    Alex Rogers
    Jun 12

    Can you post the CONFIG.TXT file that was written to the SD card here.

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    Michael Bruno
    Jun 12

    Fiz o teste nos dois aparelhos usando a mesma configuração... porem o cartão antigo (Sandisk ultra) gravou 15 minutos e o cartão no (Sandisk extreme) não gravou nada.

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    M
    Michael Bruno
    Jun 12


    Like

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    Michael Bruno
    Jun 12

    Alex boa tarde!!!

    Seguinte ... comprei outro cartão (em anexo), porém não esta gravando nada. Coloquei o cartaõ antigo e gravou por 15 minutos. Agora o novo cartao (Sandisk extreme) não está gravando absolutamente nada. O que devo fazer? Preciso para gravação de morcegos. Configuro o AUDIOMOTH mas nao esta gravando nada.

    Aguardo retorno



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    Michael Bruno
    May 13

    Alex eu vou comprar outro cartão. Me confirma por favor se e este.

    firma por favor se seria este abaixo.

    Like
    A
    Alex Rogers
    May 13
    Replying to

    No. We recommend the Sandisk Extreme - https://www.openacousticdevices.info/sd-card-guide


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    Michael Bruno
    May 13

    Bom dia Alex... encaminho os arquivos para voce dar uma olhada.... Se precisar formatar o cartão como faz para reformatar como FAT32 ou exFAT. Eu configurei o Audiomoth para gravar 20 minutos para azer teste e apos 14 minutos ele fica 0KB. Te mando a foto do cartão que estou utilizando.






    Like
    A
    Alex Rogers
    May 13
    Replying to

    I think Sandisk Ultra card may be too slow to record at 384kHz - it will likely not be able to keep up with the AudioMoth. Make a recording of yourself counting to ensure that the resulting recording is okay. We recommend Sandisk Extreme cards for high sample rates as it is a U3, rather than a U1, card and has low power consumption. I don't think that is the problem here though. I think the file allocation table on this card is full and would be restored by reformatting. Double click Computer on the desktop to open Windows File Explorer. Right click the SD card and select Format…. In the pop-up window, choose FAT32 under File System tab. If the card is greater than 32GB, Windows 7 may not let you choose FAT32 so choose exFAT instead.

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    Michael Bruno
    May 13
    Replying to

    @Alex Rogers entao, eu fiz o que voce me passou, mas o cartão a estava em ex-FAT. Formatei, mas o problema continua. Entao voce acha que tenho que adquirir outro cartão do tipo Sandisk extreme.?

    Like

    A
    Alex Rogers
    May 13
    Replying to

    @Michael Bruno


    If you record your voice speaking, is the recording okay with no skipped sections?


    It would be worth trying another card. Do you have more than one AudioMoth so you can see if the problem follows the SD card?


    I don’t think the speed of the card will cause this issue but you could try recording at 48kHz instead and see it the problem persists.


    What batteries are you using? Is it possible for you send me, or to post somewhere, the last recording that the AudioMoth made so I can see the battery voltage.


    I doubt it is a battery issue as normally the files are shorten, rather than stopped. In this case, the AudioMoth opens each file, but the writing of the file fails at some point, so the file is not closed and it has very length.


    i think this is a problem with the SD card, or because the SD card is full and needs formatting. If formatting didn’t fix it, try a different SD card. Sandisk Extreme work really well with AudioMoth.




    Like

    A
    Alex Rogers
    May 13

    I suspect that either the battery is going flat - the voltage reported in the last successful file will tell you that - or the SD card is full - reformat it as FAT32 or exFAT - deleting files often just hides them and leaves no space in the file allocation table.

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    A
    Alex Rogers
    May 13

    Can you post a screenshot of the contents of the SD card, the CONFIG.TXT file, and one of the non-0KB files. Also try reformatting the SD card and try again.

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    Michael Bruno
    May 13

    Alex boa noite. Finalmente consegui atualizar o firmware para o 1.7. Porém fiz o teste e novamente e para minha surpresa após 14 minutos a gravação, os files ficam 0KB. Por favor o que devo fazer?

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    Michael Bruno
    May 11

    windows 7

    Like
    A
    Alex Rogers
    May 11
    Replying to

    Ah. To work correctly on Windows 7 you need to manually install the USB CDC Serial Port driver. Later versions of Windows and all other operating systems automatically include the driver. There is a sequence of instructions here that should guide you through the process - https://www.openacousticdevices.info/support/main/comment/5bd1eb4b3df870002e872778

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    Michael Bruno
    May 11

    Ok Alex, vou tentar em outro computador e te dou noticias. Obrigado

    Like
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    Alex Rogers
    May 11
    Replying to

    @Michael Bruno What version of Windows is this?

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    Michael Bruno
    May 11

    E estou usando windows. Quando eu aperto fllash aparece esta primeira tela e depois aparece a segunda tela abaixo.




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    Alex Rogers
    May 11
    Replying to

    What version of Windows is this? This seems to be a problem with the serial interface - it tells the AudioMoth to switch and then can't see the standard bootloader. Is it possible to try on another computer?

    Like

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    Michael Bruno
    May 11

    Alex é esta tela que aparece, porém apos apertar o botão flash aparece essa outra tela que eu lhe enviei acima.


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    Alex Rogers
    May 11