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→Q: I imported my data into SleepyHead and when I put the card back into my Resmed S9, I get an error that says: " 'Invalid SD card, erase card data?". Why is this happening and what should I do?
== Q: I imported my data into SleepyHead and when I put the card back into my Resmed S9, I get an error that says: " 'Invalid SD card, erase card data?". Why is this happening and what should I do? ==
A: SleepyHead did not cause the problem; your operating system did. The operating system wrote some hidden files to the card, and the S9 does not want anything on the SD card that it did not write to the card. All versions of Mac OSX will write hidden files to an unlocked SD card. Windows 8.1 is also known to write hidden files to an unlocked SD card. To fix the problem:
* Let the S9 erase the card and rewrite the summary and compliance data to the card. You will NOT lose any data that you've already imported into SleepyHead. And the summary and compliance data that your DME and sleep doc care about will be written back to the card.* To prevent the problem in the future: Be sure to lock the SD card before inserting the SD card into your computer or card reader. You lock the SD card by sliding the "Lock" tab on the side of the card to the Locked position. That will prevent the operating system from writing hidden files to the SD card.* After importing data into SH and removing the SD card from your computer, remember to unlock the card before putting it back into your S9 PAP. If you forget to unlock the card, you might see an error message on the S9's LCD telling you that the inserted card is read only. '''NOTE: ''' Using Rescan on a Win 8.1 machine will NOT prevent this problem from happening; Win 8.1 will still write hidden files to an unlocked SD card and when you put the card back in the S9, the S9 will still insist on erasing the contents of the card.
=== NOTE AND WARNING for WIN 8.1 USERS ===
Some Win 8.1 users have reported that locking the SD card does NOT prevent their computer from writing files to the SD card. The lock switch on the SD card is a physical switch and not all SD card readers have a corresponding physical switch in them that recognizes and respects the SD card's lock switch. You can test whether your Win 8.1 machine will ignore the Lock switch by doing the following:
* Step 1) Place a Locked SD card into the machine. I'd suggest an SD card that is NOT the one from your S9 machine.* Step 2) Try to save a file of your choice to the SD card in the usual way.
If the computer writes the file to the SD card, then you know that the simple fix of locking the SD card is NOT going to work on your computer and its SD card slot: The Win 8.1 operating system will continue to write those hidden system files to the SD card in spite of the card being locked.
What to do next depends on which Win 8.1 operating system you have and how comfortable you are with some advanced features of the Win 8.1 operating system. Here are two things you can try:
* Try an external SD card reader plugged into a USB port. If the external SD card reader has the right kind of physical switch to detect the position of the SD card's lock tab, that should prevent Win 8.1 from writing the system files to the SD card.
* Try following these instructions from MS about how to prevent Win 8.1 from writing system files to removable media Note that these instructions specifically indicate that some of the suggestions are NOT applicable to Windows 8.1 Home edition.
== Q: Will SleepyHead work on my computer? ==
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