Thread: External HDD with automated CFast card dump

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  1. #1 External HDD with automated CFast card dump 
    Senior Member Samuel H's Avatar
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    Since CFast is so expensive, I was thinking about getting a single 256GB card (which, for me, should be enough for one day of shooting RAW 3:1 on the pocket 4k) and dumping it every night. At home I can just use my PC, but when away... there are some external HDD drives that can dump cards automatically, but I've found nothing able to do it with CFast cards. The WD mypassport wireless pro can do it from a USB CFast card reader, but it's too slow because that connection is only USB2 and can't even work at full USB2 speed: it's been measured at 25 MB/s, which means three hours to dump 256 GB.

    Does anybody know of an external HDD that can automatically dump CFast cards? (hopefully with some sort of data integrity check)

    If not: time to convince somebody to make one using a raspberry pi or something...
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  2. #2  
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    CinemaDNG RAW 3:1 - 129 MB/s

    129 MB/s = 3096 MB/ minute (24fps per seconds)

    256000 : 3096 = 82

    ...

    82 Minutes record time... enough for one day of shootong? Well. Depends on what you are going to shoot.

    I also checked "C-Fast Reader HD Backup Solutions" but found noting good.
    Or it is pretty expensive.
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  3. #3  
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    Don't know I just bought 2 256GB komputerbay cards. You will need 2 cfast cards to shoot 60fps 4K anyway. Just bite the bullet, it aint cheap, but it aint that costly anymore either.
    Update: thats only on the UM46K I see now.
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  4. #4  
    Senior Member Samuel H's Avatar
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    Quote Originally Posted by S_Berger View Post
    CinemaDNG RAW 3:1 - 129 MB/s

    129 MB/s = 3096 MB/ minute (24fps per seconds)

    256000 : 3096 = 82

    ...

    82 Minutes record time... enough for one day of shootong? Well. Depends on what you are going to shoot.

    I also checked "C-Fast Reader HD Backup Solutions" but found noting good.
    Or it is pretty expensive.
    It sounds like you found exactly the same stuff that I did: just one thing, way too big and expensive to be an option

    And for the record: you got your calculations wrong
    CinemaDNG RAW 3:1 is 129 MB/s at 30fps, which means 103 MB/s at 24 fps. That is 6192 MB/min.
    256000 / 6192 = 41 minutes on a 256 GB Cfast card.

    Which yes, is usually enough for a full day for me and the kind of stuff that I shoot.


    ---------------

    RE: raspberry pi: right now there's no card with USB3, and the real world tests I'm finding are not great. The lastest cards are getting 35MB/s at best, which is close to the USB2 real-world limit.... and not much better than that WD off-the-shelf thing.
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  5. #5  
    Senior Member Frank Glencairn's Avatar
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    Laptop is still you best bet, all other "solutions" I saw so far suck.

    I was thinking about building a cheap computer, with a docking station and card reader into a Pelicase, that runs from V-mounts - but actually it's not worth the trouble.
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  6. #6  
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    would recording direct to a USB-C SSD be an option
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  7. #7  
    Senior Member Samuel H's Avatar
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    It's an option, and I have a 3D printer so I can build my own custom holder or pseudo-cage. But I'd rather leave the camera as a single peace and not have any cables connected anywhere.
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