How long does a data card last till full?

[proterra]

I have had a system one CPAP since the middle of November 2011 and used it every night. My question is how long till the data card is full and what happens next does it overwrite old data.?

I tend to download it to sleepyhead weekly so I have stored data.

Plus I have an appt at clinic at the end of Feb so I presume they will download when I go. I have been told to take my machine with me, is this normal of just take the data card.?

I look forward to hearing from other peoples experiences with the data.

[Fredxx]

Yes, it is normal to take the machine. They will check it is still working properly as well as checking the data

[Kipper]

Take everything with you, machine, mask, tube, as they should all be checked. I do not have any idea of the data stored, I leave that to the experts at the hospital to decide what changes are needed when they look at the data - it's what they are paid for.

[symmit]

Both my machines store a years compliance data and being autos a month's detailed data.

[proterra]

Thanks for all the replies.I will download all info on card into sleepyhead before going in case they wip[e it clean.