How to write grub-install /dev/hda from live cd

where is the root here "/"

Disk /dev/hdc: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x16ed16ed

   Device Boot Start End Blocks Id System
/dev/hdc1 * 1 5287 42467796 7 HPFS/NTFS
/dev/hdc2 5288 5924 5116702+ 83 Linux
/dev/hdc3 5925 9729 30563662+ 83 Linux

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00d700d7

   Device Boot Start End Blocks Id System
/dev/sda1 * 1 6048 48580528+ 7 HPFS/NTFS
/dev/sda2 6049 19456 107699760 f W95 Ext'd (LBA)
/dev/sda5 6375 19456 105081133+ 7 HPFS/NTFS