Yes - you've got a failing hardware component - card or reader probably.
IrfanView is just showing you a jpeg preview, not the raw data, like Lightroom is showing.
@Rob - i first copied the file from the card to the hard disk. Once on the hard disk. LR shows the line but irfanview does not. So i dont think its the reader, unless its puts some junk in that LR is sensitive to but irfanview can tolerate.
It is very common for raw data to be corrupt (what Lr is showing you), but jpeg preview to be OK (what irfan-view is showing you).
Put another way: You can not conclude anything about the raw data based on what irfan-view is showing you.
Your raw data is corrupt (Lr has shown you that), begging the question: which component caused the corruption.
I have my suspicions, but please report back when you find it.
Horizontal and vertical lines could be due to the sensor in the camera — although other forms of hardware corruption (as described by Rob) should be investigated as well.
Horizontal and vertical lines could be due to the sensor in the camera
But they're not in the jpegs - I don't see how sensor problem would be evident in raw data but not jpegs - do you?
Yes, that's a very good point ... you're probably right
@rob - i didnt read the 2nd sentence about how irfanview only shows the jpg from the raw...
i downloaded sony's lightroom and the streak is there, so definately in the raw file.
it only happens once in a while (1/50 pics), so probably not the sensor?
ill use a new card and see what happens.
anyway, its clear to me know its not a LR issue. thanks!