Lr4 cannot read raw files from SD reader (bug?)

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  • Updated 6 years ago
I posted this problem earlier and I'd post new information there ... however, that topic was marked "solved" when apparently the problem still exists ...

http://feedback.photoshop.com/photosh...

I thought the problem was solved because Lr4 successfully saw the raw files (Panasonic RW2) after I formatted the SD card with the camera. However, to day it is again not seeing the raw file, even after formatting the card 30 minutes ago and taking only a single photo (raw+jpeg).

This is apparently a Lr4 problem because (1) Lr3 (still installed on the same computer) can see the raw file on the SD card. The only way Lr4 can see the raw file is if I copy it to a temporary location on the harddrive first and import from there.

As to those who might believe that it may be a problem with the card reader or card itself, Lr4 cannot also see the raw file if the computer is connected to the camera itself via the USB port.

Again ... this has to be a Lr4 bug! ... why else would Lr3 work and Lr4 not??
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rarewolf

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Posted 6 years ago

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jdv, Champion

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This is almost certainly bad media. Test this by using a different card.

The reason you can "see" the image on the SD card is that you are probably using a basic tool to look at the image. A raw image has an embedded preview that most tools use when showing the image (you can't really display a raw image; it wouldn't look anything like you expected it to.)

But Lightroom reads pretty much the entire contents of the raw file and constructs its own preview. Because few programs actually read the entire contents, but rather just open the preview, Lightroom will find corrupt images even if the image appears to be fine to some other app.

Lr3 and Lr4 might differ in how they extract images from the chain that connects the SD card to the app.

Test with a new SD card. This is the best way to rule out typical media corruption.

The fact that the card appeared to work for awhile before failing again is an indication that the problem lies with the card, or the link to the card. The problem with intermittent problems is that switching one thing, like the version of the app, may not actually be that significant. Your best way forward is to work from the known to the unknown, testing assertions as you go.

The fact is that it is highly unlikely that the app is /directly/ at fault here. All examples of problems I've seen over the years like this have devolved to the SD card, the USB link or the reader (or some combination thereof.)

But it is pretty simply to prove conclusively. Remember to try different USB ports, cables and read directly from the camera.
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rarewolf

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I posted this problem earlier and I'd post new information there but that topic was marked "solved" when apparently the problem still exists ...

http://feedback.photoshop.com/photosh...

I thought the problem was solved because Lr4 successfully saw the raw files (Panasonic RW2) after I formatted the SD card with the camera. However, today it is again not seeing the raw file, even after formatting the card 30 minutes ago and taking only a single photo (raw+jpeg).

This is apparently a Lr4 problem because (1) Lr3 (still installed on the same computer) can see the raw file on the SD card. The only way Lr4 can see the raw file is if I copy it to a temporary location on the harddrive first and import from there.

As to those who might believe that it may be a problem with the card reader or card itself, Lr4 cannot also see the raw file if the computer is connected to the camera itself via the USB port.

Again ... this has to be a Lr4 bug! ... why else would Lr3 work and Lr4 not??

This reply was created from a merged topic originally titled
Lr4 cannot read raw files from SD reader (bug?).
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rarewolf

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... but it can see the raw G3 RW2 files if I copy them to my harddrive first.

I reported this problem some time ago, and no one had an answer ... but then I thought I found the remedy after re-formatting my SD card using my G3 camera ... ie, the raw files magically appeared to Lr4, and I was a happy togger again.

HOWEVER ... using the same formatted SD card, I find that Lr4 is again not seeing them ... ie, unless I first copy them to my HD.

Also, of note ... Lr3 never had this problem, but because it seems to be relative to a questionable G3 format, I'll post the same query to a Panasonic forum to see if anyone else has the same problem ... and, I also suppose it could be the Sandisk Extreme Pro SD ... but still ... Lr3 never did have the problem ... weird??

TIA :)

This reply was created from a merged topic originally titled
Lr4 not seeing raw files on SD card ....
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rarewolf

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Thanks for re-instating this final post ... I believe others may benefit from the complete discussion.

I suppose you may be correct --the difficult pill to swallow is that it means I have to buy a new card just to try it out ... i.e., Sandisk has already ruled out their card because Finder can "see" the files, and you aren't providing me with any ammunition either. I could hope to print this entire thread, and hope that Bestbuy might honor a replacement.

Thanks again :)
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jdv, Champion

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SD cards are notorious for failing early. There are even indications that rejected electronics are making their way into the part stream for even high-end brands. It's a bit of a dirty little secret. Some manufacturers know some lots are just bad, but it's a gamble they can often win because these things don't fail absolutely. Most people might not even notice. (For interesting reading, start here: https://sites.google.com/a/intelligen...)

What you describe sounds like a bad link between the reader and whatever is reading the data.

The Finder can see the first few bytes, and even load the preview. I suppose it is doing a read to get the data to the filesystem, probably as a regular mounted RW volume.

But an SD card is not like other media. It has software in it that spreads the load over the media and maps out bad blocks. So, a series of tests is going to keep moving that data around.

I'd try a combo of ways of getting the same data into Lr4, trying 3-4 times each time without reformatting or adding data to the media (keep the tests read only when comparing Lr3, Lr4, USB ports, cables etc.
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rarewolf

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Those tests may reveal something ... but I cannot imagine what. Keep in mind that these files are good files -- there's absolutely nothing wrong with them. If I copy them to the HD first and import them from there, DNG conversion is perfect, and I have to believe the DNG converter is more rigorous than whatever algorithms that may be rejecting the import from the SD card. If it is indeed a Lr4 rejection mechanism as you may suggest ... the files themselves suggest Lr4 is rejecting good files, and may be too rigorous(?)

Cheerios :o)