Mac terminal drive mapping

[moonliiner]

I am reading the instructions for unmounting the SD card to load disk Android img for Nook Color. It stresses being careful to put in the correct disk # as follows:

Open a terminal window.

Find which drive the sd card is mapped to: type in the terminal this:
diskutil list

Be very careful to identify the SD card and not your hard disk. Be VERY careful.

However in terminal there are two disk numbers for each. On the left there are disk #'s but on the right there are "identifiers" that differ. I see the 8GB SD card, on the left it is disk 0: and on the right identifier it is disk 1. Which do I use?

Here's what the terminal reads:

/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS MacBook Pro HD 499.8 GB disk0s2
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.0 GB disk1
1: Windows_FAT_32 boot 123.3 MB disk1s1
2: Linux 699.1 MB disk1s2
3: Linux 699.1 MB disk1s3
4: Windows_FAT_32 sdcard 1.3 GB disk1s4