I agree with other posted suggestions. Get yourself a cheap 2GB SD card and use that or get one out of your digital camera if you have one and use that. Reformat it first. A 2GB card will last you a lifetime. The CPAP writes very little info on it daily. Insure that the write-to button is enabled, and NOT toward the short end or the copper connection end.
I notice that you are not using software, so I might encourage you to download the free SleepHead or Encorebasic software from this site. It is quite beneficial to see how your progress is going.
If you feel that you have received or used beneficial infomation such as available free software downloads or free clinician manuals from this web site, I might suggest a donation to the ApneaBoard owner/operator.
Yesterday is history; Tomorrow is a mystery; Today is a gift; Thats why its called "The Present".