dmesg

sda: sda1 sda2 sda3 sda4
sd 0:0:1:0: [sda] Attached SCSI disk
EXT3-fs (sda2): error: couldn't mount because of unsupported optional features (40)
EXT2-fs (sda2): error: couldn't mount because of unsupported optional features (40)
EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
FS: Mounted root (ext4 filesystem) readonly on devce 8:2
Freeing unused kernel memory: 528K freed
Write protecting the kernel read-only data 6144k
Freeing unused kernel momory: 132k freed
Freeing unused kernel memory: 648k freed