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Old 12-01-2010, 07:43 AM   #1
Renji
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SD Card Importance? SDHC, SDHC Class 4, Class 10 etc is it important

Hi All,
I have a PRS-650 but I suppose it's a general question for anyone who has an ebook reader with a SD Slot, I wanted to ask if it makes a difference which class I use for my SDHC card? I know they have Class 4, 5 and 10 on the top of my head, but does it make a difference with loading speeds of the books etc

Currently I'm using a 8GB SDHC Class 4 but planning to get a 16GB Class 10 if the speeds actually make a difference.

Thanks
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Old 12-01-2010, 08:10 AM   #2
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Hi Renji,

It's very unlikely that you'd see notable difference. Even more, some class 4,5 cards might be faster than other class 10 cards.
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Old 12-01-2010, 09:06 AM   #3
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I don't think SD speed is really important for books. I don't even notice the difference with lossless music (about 800-1000 megabit/second). For cameras it might matter. For watching video -- maybe. For books -- I don't think so.
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Old 12-01-2010, 10:03 AM   #4
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if you are talking about cameras, ALWAYS get the the fastest card you can that does not blow up your purse. But talking about sony reader, I would assume the only boost you'll get from fast card is fast index time which is only happens the first time you add new books.

So IMO, we can get away with the economic choice... just go for the best bang for the buck
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Old 12-01-2010, 10:04 AM   #5
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Great news then LOL I was seriously going out to buy a 16GB but I now I know don't need too and I still have only used 1GB of my current 8GB card, I'm not going on a holiday yet so don't think need to load up that much books. Currently I have 53 loaded and haven't read all of them yet.
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Old 12-01-2010, 12:30 PM   #6
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I have 50 books on the 1 GB SD card I keep in my reader, and it's a drop in the bucket!

A while back I bought a 16 GB card to back up my audiobooks and videos, in case my hard drive crashed - some of those movies run .5 GB each!
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Old 12-01-2010, 12:52 PM   #7
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If you are talking about ePub books, most seem to be no more than 5MB and you could get close to 200 5MB books onto a 1GB card. If you are talking about scanned PDFs then they can be much larger, but even if they were 50MB each you could still put about 20 of them on a 1GB card. Either way, that should be more than enough space to get you through a vacation!
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Old 12-01-2010, 01:04 PM   #8
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5 MB's???

I pulled three Epub books at random from my library wish list - they are 798, 1179 and 2485 KB's each!
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Old 12-02-2011, 04:22 PM   #9
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Quote:
Originally Posted by hoichi View Post
I don't think SD speed is really important for books. I don't even notice the difference with lossless music (about 800-1000 megabit/second). For cameras it might matter. For watching video -- maybe. For books -- I don't think so.
---------------------------
I agree. For video, I'd go with the faster class 10. For books, music, pictures...standard class 4 is just fine.
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Old 12-03-2011, 12:41 PM   #10
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I've done some very quick and non-scientific tests with class 4,6 and 10 cards and different book sizes (.25-5MB). Basically I was unable to detect any noticeable differences at all on a PRS-505 and a PRS-950, so if the card is exclusively for your reader you can safely buy the cheapest/slowest one you can find.
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Old 12-03-2011, 12:53 PM   #11
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If, however, you think you'll ever want to use the card in a camera, it is worth shelling out a bit more for a faster card. I made the mistake of trying to use a slow card in a camera, and it would only take a few seconds' worth of video before stopping the recording, because the card couldn't keep up with the data writing speed. Very annoying, especially since (naturally) I only discovered the problem when I first tried to use it for real!
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Old 12-03-2011, 01:30 PM   #12
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Very true. Minimum speed for cameras with a video recording function is class 8 in my opinion (at least if the camera is fairly recent). And the price difference is hardly prohibitive.

However, if you're currently using an old, slow card and wonder if there's any point in buying a new one just for your reader: no there isn't.
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