Hi All,
New here, first post.
I just got the DR-70 and I had been reading everything discussed here about the card pitfalls and such before buying it. A couple of quick observations, just to add to the "pile" for completion's sake.
I decided to play it safe and order the SanDisk Extreme Pro 64gig card as recommended by Tascam, and it works flawlessly so far. After upgrading to software ver. 1.11, I stress-tested both the machine and the card by full-formatting the card and then letting it record for hours on 24/96 with four Phantom Power mics attached, and there was no problem that I have found.
Now, I had a Sony SDXC 64-gig card (SF64UY/TQMN) laying around, and I formatted that as well and gave it the same test as above. This, too, was fine.
The interesting part is that the rated speed of the SanDisk card is 95mbs whereas the Sony claims 40mbs and yet the 40 seemed to be enough to roll through on high settings and four channels without hiccups...what it means, I don't really know.
To me it is curious that the cards can be that far apart in performance numbers and still be viable. I have put the Sony card into the card database here as "good."
Either the Sony is very efficient or maybe the "extra" speed of the SanDisk is recommended for safety, and that is fine. Much as with battery capacity, I don't trust card numbers fully.
The one error I got was one I went looking for: I formatted and recorded on one of my SDHC Sandisk 32-Gig cards (SDSDU-032G-A46) and after exactly 15 seconds I got "Write Timeout"...the card couldn't keep up. It happened each time after 15 secs.
Other than that, so far in testing it with voice and acoustic guitar, the Tascam is an excellent little performer, and the pres are nice and quiet
So some rambling, but maybe useful; I look forward to contributing here...
Claus.