Windows and macOS X do not support the ext4 format, so when you read the SD card, only the File Allocation Table (FAT) partitions will be accessible. In addition, Windows only supports the first partition on an SD card, so if you've installed NOOBS, only the RECOVERY partition will be visible. If you've written your card manually, you will be able to access the BOOT partition.
The data partition (if you installed one via NOOBS) and the root partition are in ext4 format and won't usually be visible on non-Linux systems.
If you do need to read files from the SD card using Windows, a freeware program, Linux Reader (available at www.diskinternals.com/linux-reader) can provide read-only access to all of the ...
