Number of multi-track recording hours – Flash Drives?

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This topic contains 5 replies, has 2 voices, and was last updated by Profile photo of Salislore Salislore 5 years, 5 months ago.

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  • #55456
    Profile photo of Salislore
    Salislore
    Participant

    Hi,

    I did a search but couldn’t find anything. I think it would be helpful for everyone (a sticky?) if someone could list the estimated number of hours each Flash Drive size can record in 18 multi-track mode:

    16GB = X hours
    32GB = X hours
    64GB = X hours
    128GB = X hours.

    Can anyone provide that information?

    Thanks,
    Salislore

    #55457
    Profile photo of Andreas
    Andreas
    Moderator

    Normally that information could be taken from Understanding Qu-Drive and USB Devices:

    The maximum file size on FAT32 is 4 GB. Qu-Drive audio data rate per track is 8.24 MB / minute (144 KB / second). This would allow a maximum recording time of roughly 8 hours. For 18 tracks you would need 72 GB drive capacity for the maximum recording time.

    So:
    (16 * 8) / 72 = ~1.7 hours
    (32 * 8) / 72 = ~3.5 hours
    (64 * 8) / 72 = ~7.1 hours
    (128 * 8) / 72 = ~8 + ~6.2 hours

    #55555
    Profile photo of Salislore
    Salislore
    Participant

    Andreas,

    I did see that reference in “Understanding Qu-Drive and USB Devices:”, but it was unclear to me. I do have a better understanding now that I looked at your math.

    The only remaining question I have is: I’m not sure what influence the maximum file size on FAT32 being 4GB has, if any?

    Thanks for your response.
    Salislore

    #55556
    Profile photo of Andreas
    Andreas
    Moderator

    The 4GB filesize limit restricts maximum take length to 8 hours for multitrack recordings and 4 hours for stereo recordings. That’s why a 128GB drive can hold one 8 hours recording (limited by file size) plus one 6.2 hours recording (limited by remaining space).

    #55557
    Profile photo of Salislore
    Salislore
    Participant

    Never mind. I figured it out.

    Thanks.

    #55558
    Profile photo of Salislore
    Salislore
    Participant

    Ha! I didn’t see the response you just sent.
    Thanks.

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