Hi : ) !!! - Which SD card??

igmolinav

macrumors 65816
Original poster
Aug 15, 2005
1,112
2
Hi : ) !!! - Which SD card??

Hi,

I'll be using a Sony A7ii together with a Zoom Recorder H2-N.
The Sony allows for (video) clips of up to twenty nine minutes
to be made.

Would a Sandisk 32 GB Extreme SD Card be enough for such a
clip length?? That is like allocating 1 GB of the card per minute
of video recording.

Does an audio recorder, like the Zoom H2-N recorder, needs a
32 GB SD card, as well, to record a half hour dialogue?

Thank you, kind regards,

igmolinav : ) !!!
 

sevoneone

macrumors 6502
May 16, 2010
489
398
Record time is going to vary based on the settings you use on your A7.

If you are using the highest video quality settings, the camera will record ~50Mbps. Note that is megabits per second (Mbps), not megabytes per second (MBps). There are 8 bits in a byte, so we need to divide 50 by 8 to know how many megabytes of storage we will need for every second of video recorded. Then figure out how many seconds in 29 minutes, and finally multiply the results together and approximate how much storage is needed to capture 29 minutes of video at 50Mbps.

50 / 8 = 6.25MBps.
29 * 60 = 1,740 seconds
1,740s * 6.25MB/s = 10,875 MB

There are 1,024 MB in a GB: 10,875 / 1,024 = 10.62 GB

So a 32 GB SD card is more than plenty for storage. SanDisk Extremes are good cards too, and should be plenty fast enough to record 50Mbps video.

Audio bit rates are much much lower. A 32 GB card is probably way overkill for your Zoom as it would hold 2+ days worth of recordings. I'd get a couple of cheap SanDisk 4GB cards, each will hold 4 to 5 hours of recorded stereo audio.
 

kohlson

macrumors 68020
Apr 23, 2010
2,265
661
Audio bit rates are much much lower. A 32 GB card is probably way overkill for your Zoom as it would hold 2+ days worth of recordings. I'd get a couple of cheap SanDisk 4GB cards, each will hold 4 to 5 hours of recorded stereo audio.
I use a 32GB in a Tascam DR100, recording 2 channels (hi/low). The last time I looked is was perhaps half full, there are probably 100 sessions on it, ranging from15-90 minutes. Most are 3-45 minutes.
 

igmolinav

macrumors 65816
Original poster
Aug 15, 2005
1,112
2
P.S.

Hi,

I was thinking about getting two 64 GB cards for video.
However, it is perhaps better to 'reduce' the risk of
damage, to have smaller cards. For example, to have
four 32 GB cards. That way, if one gets damaged for
any reason, it will only be one 32 GB card and not one
64 GB card! What do you think?

Thank you, kind regards,

igmolinav : ) !!!
 

igmolinav

macrumors 65816
Original poster
Aug 15, 2005
1,112
2
Hi,

Thank you for your message : ) !!!

Kind regards,

igmolinav : ) !!!
 

kohlson

macrumors 68020
Apr 23, 2010
2,265
661
To be sure, SD cards are not a good place for long term storage of media. Once the content has been captured, best to move the data to a disk drive as soon as possible.
 
Last edited:

Vanessa D

macrumors newbie
Apr 23, 2016
12
1
I use a minidrive with 256GB.
But I don't remove it from the computer, I use an USB adapter to acces the photos in other SD cards
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.