How to check how many External Hard Drives are connected to Linux Server

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http://unix.stackexchange.com – Is there a way to distinguish between the Internal Hard drives and External Hard drives. Actually i need to see how many External hardrives do we have and to which server are they connected . This is the Screenshot i took and by judging by its name SDE is external hard drive. But im not sure . So help me out. Further actions Ok now i used lsusb and it said Western Digital Drive connected and its Drive No is SDE. But by using dmesg it said that sdb is also a removable disk. Any suggestions 'sd 0:0:1:0: Attached scsi removable disk sdb Vendor: WDC Model: WD2500YD-01NVB1 Rev: (HowTos)