Your ResMed device records detailed breathing data every single night — flow waveforms, pressure adjustments, leak rates, and event timestamps. But when you check the myAir app each morning, you see a simplified score. The full data is still there, on the SD card inside your machine. This guide shows you exactly how to access it, whether you have an AirSense 10 or an AirSense 11.
Medical disclaimer: This article is for informational purposes only. AirwayLab is not a medical device, and nothing here constitutes a diagnosis or treatment recommendation. Always discuss your therapy data and any concerns with a qualified sleep specialist or clinician.
What Your ResMed Device Actually Records
ResMed devices record two distinct layers of data simultaneously. One goes to myAir. The other stays on the SD card.
Summary data (myAir / cloud)
- Usage hours
- Headline AHI (apnea-hypopnea index)
- Mask fit / leak rate score
- myAir daily “score”
Detailed data (SD card / EDF files)
- Continuous flow waveform (breath-by-breath)
- Pressure changes throughout the night
- Detailed leak rate over time
- Individual event timestamps (apneas, hypopneas)
- SpO₂ and heart rate (if oximetry sensor present)
The EDF files on the SD card are the same files that OSCAR, SleepHQ, and AirwayLab use for detailed analysis. myAir only shows you the summary layer.
What myAir Shows — and What It Doesn't
myAir shows
- Usage duration each session
- Nightly AHI score
- Mask fit percentage
- Overall daily score
myAir does not show
- Raw flow waveform data
- Flow limitation percentage or patterns
- RERA-type breathing events
- Access to your EDF files
myAir is a convenient compliance monitoring tool. Detailed analysis of breathing patterns — including flow limitation, breathing regularity, and event timing — requires access to the SD card data. Your clinician can help interpret the full picture from the detailed data.
AirSense 10: How to Download Your Data
Power off your AirSense 10. Unplug the machine from power.
Locate the SD card slot on the right side of the machine (when facing it from the front). There is a small rubber cover protecting the slot.
Remove the SD card. Press the card inward gently until it clicks, then let it spring out. Pull it free.
Insert the SD card into your computer. Use a built-in SD slot or a USB SD card reader. The card appears as a removable drive.
Open the DATALOG folder on the card. This folder contains your session data in EDF format, organised by date.
Tip
Removing the SD card does not erase your data or reset your machine settings. Your AirSense 10 stores therapy settings internally. It is safe to remove and reinsert the card at any time when the machine is powered off.
AirSense 11: How to Download Your Data
Power off your AirSense 11. Unplug the machine from power.
Find the SD card slot on the left side of the machine, behind a small cover panel. The AirSense 11 uses a micro SD card, often seated inside a full-size adapter.
Remove the card. Press gently until it clicks and springs out. If a micro SD is inside an adapter, remove the whole assembly.
Insert into your computer.If you have a micro SD in an adapter, insert the adapter into your computer's standard SD slot. The card appears as a removable drive.
Open the DATALOG folder. The folder structure is the same as the AirSense 10: date-organised subfolders containing EDF session files.
AirSense 11 note
Some AirSense 11 units ship without a pre-installed SD card. If your machine has no card, insert any Class 10 micro SD (8 GB or larger, formatted FAT32). The device will begin recording detailed session data from the next therapy session.
What's on the SD Card
When you open the SD card on your computer, you will see a folder structure like this:
SD Card/ ├── DATALOG/ │ ├── 20260101/ │ │ ├── BRP.edf ← continuous flow waveform │ │ ├── EVE.edf ← event log (apneas, hypopneas) │ │ └── SAD.edf ← SpO₂/HR data (if sensor present) │ ├── 20260102/ │ └── ... ├── SETTINGS/ ├── Identification.tgt ← device model info └── STR.edf ← machine settings
BRP.edf
The most important file. BRP stands for Breathing. This EDF file contains the continuous flow waveform — the breath-by-breath airflow signal recorded at 25 Hz. It is what tools like AirwayLab use to detect flow limitation patterns, RERA-type events, and breathing regularity metrics.
EVE.edf
The event log: timestamped apnea, hypopnea, and other event records from the device's own detection algorithms. This is what your AHI is calculated from.
SAD.edf
SpO₂ and heart rate data from an attached oximeter. Present only if you are using a compatible ResMed oximeter. Not all users will have this file.
Beyond myAir: Tools That Show More
Once you have access to your SD card data, two main tools can open it for detailed analysis:
OSCAR
A free, open-source desktop application for Windows, Mac, and Linux. OSCAR reads your EDF files and displays charts for flow, pressure, leak rate, and events. It requires installation and runs entirely on your computer — no data leaves your device. A solid choice for users who prefer a desktop tool.
AirwayLab
A browser-based analysis tool. Drag your DATALOG folder into AirwayLab and your data loads immediately — no installation, no account, and no data upload required. All processing runs in your browser. AirwayLab adds four analysis engines on top of basic CPAP charts: the Glasgow Index (breath shape scoring), WAT (breathing regularity and periodicity), NED (flow limitation and estimated RERA patterns), and an oximetry pipeline with 17 metrics.
See how it compares: Analysing Your ResMed SD Card in the Browser
Both tools are complementary to myAir, not a replacement for it. myAir handles daily compliance tracking and syncing with your sleep clinic. These tools give you the detailed view when you want to understand what's happening breath by breath. Your clinician can help interpret the findings from either tool.
Frequently Asked Questions
How do I download data from my ResMed AirSense 10?
Power off the machine, remove the SD card from the left side, behind a small cover panel, insert it into your computer, and open the DATALOG folder. The .edf files inside contain your full therapy data. Analysis tools like OSCAR and AirwayLab can read these files directly.
Does ResMed AirSense 11 have an SD card?
Yes. The AirSense 11 uses a micro SD card rather than a standard SD card. Some units shipped without a card pre-installed — you can insert a Class 10 micro SD (8 GB or larger) and the device will begin recording detailed data from the next session.
What does myAir not show you?
myAir shows usage hours, headline AHI, and leak rate. It does not provide raw flow waveforms, flow limitation data, RERA patterns, or access to your EDF files. Detailed analysis of breathing patterns requires tools that read the SD card data directly.
How do I read EDF files from my ResMed CPAP?
EDF (European Data Format) files from a ResMed SD card can be read by OSCAR (desktop) or AirwayLab (browser-based, no install). You do not need to convert or open the files manually — just point the tool at your DATALOG folder.
What is the DATALOG folder on my ResMed SD card?
DATALOG is the main folder on your ResMed SD card containing your therapy session files. Inside it are subfolders organised by date, each containing .edf files — including BRP.edf (the continuous flow waveform) and, if applicable, SAD.edf (SpO₂ data).
Can I read my ResMed CPAP data without installing software?
Yes. AirwayLab runs entirely in your browser — drag your DATALOG folder in and your data loads immediately. No installation, no account, and no upload required.
Related Articles
How to Export and Understand Your CPAP Data — a broader guide covering all major CPAP brands, not just ResMed.
Analysing Your ResMed SD Card in the Browser — what AirwayLab extracts from your DATALOG files and how.
Understanding Flow Limitation in CPAP Data — the breathing pattern your flow waveform reveals beyond AHI.
OSCAR Alternative: Browser-Based CPAP Analysis — comparing OSCAR and AirwayLab for ResMed data analysis.
Medical disclaimer
AirwayLab is an educational tool, not a medical device. The analysis provided is based on published research methodologies applied to your PAP device's flow data, but it is not a substitute for polysomnography or clinical evaluation. Always discuss your therapy data with your sleep physician. The metrics described here are for educational purposes and to support informed conversations with your clinician.
Analyse Your ResMed Data Now
Upload your DATALOG folder to AirwayLab for instant browser-based analysis. No installation, no account, and your data never leaves your device.