Paula, I have built in SD on my laptop, but I also have several USB readers, so I might try one of them. I thought everything was going great. Had a few days of no erasing SD card, but then it happened. I'm not worried about data, just trying to solve the mystery. I've been super careful with handling the card properly. I assumed that with the card locked, nothing extra could be written on it. Oh well, as they say, sh*t happens.
Another possible work around you could try is this:
Sleepy Head can import the data from any folder on your machine. In other words, you can copy the contents of the SD card to a folder on your machine's harddrive and SH can import the data from that folder instead of the SD card itself. That would allow the SD card to only be "touched" by ResScan and the Windows operating system, which would allow you to test your theory that the problem is being caused by switching back and forth between SH and ResScan.
Finally another odd-ball, hopefully unlikely possible cause of your problem. Way back when I was using a Resmed S9 and ResScan (in the pre-Sleepy Head days), my SD card developed the problem that every time I used the old desktop that hubby had set up for ResScan, the S9 balked and insisted that the card be erased because of some kind of "invalid card" error. But if I merely copied the data to a folder on my Macintosh and popped the card back into the S9, the S9 didn't squawk at all about the card. At some point either I or hubby decided it was time for a virus scan on the desktop that had ResScan install on it. And low and behold, the desktop had indeed picked up some kind of a virus from the internet. Eliminating the virus from the computer fixed the problem with the S9 insisting on erasing the card after every time I downloaded the data into ResScan on that computer. So if it's been a while since you've run a full scan of everything on the computer you have ResScan installed on, it's worth doing that just to make sure you're not running into the problem I had back in Fall 2010.
Consider the possibility that the machine is writing a file to the SD card, which is in turn being misunderstood by that very same machine when the card is removed and inserted. You might want to investigate a firmware update, although I don't know if that's even possible.
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I am doing a full virus scan as I type.
Robysue, I like your idea of copying the SD card to a folder and opening SH from there. I will definitely do that. I only play with SH occasionally to see how it's different.
Sleepster, I looked and do not see a way of updating the firmware on my SD card reader, but I did go into device manager and asked it to update the drivers and it did find a newer driver.
I am assuming that when the card is locked, it cannot be written upon. I hope that's true. So, I am wondering if might be something that is caused by the Autoset. Is everyone unplugging the machine while doing this? I think I will experiment with a new non-cpap card
I have an auto set and I use both software daily. It is easier to look at the leaks in ResScan than in SH but for the most part, I use SH. As I posted, I use both daily for different reasons. I don't unplug my machine first. I do lock the card when downloading the data and unlock it before putting it back in the machine. I don't have enough knowledge to figure out what it causing your issues. Hopefully other members will be able to help you out.
thanks ME50. This time I did not lose any data, it's just an annoying message. Since I've used Rescan so much I will probably stick with it and use Robysue's suggestion to copy SD card and import into Sleepyhead when the need arises.