can't see usb hard drives

I have 4 hard drive 2 of them are external usb drives first is sda 1,
2, and 5 ext 3 the second drive is sdb1 and has a single partition
ext3 the 3rd drive is a USB sdc1 single partition ext3 . This next
drive is odd it is also USB sdh 1 ext3 . Computer file browser cannot
see the USB drives. The last tree drives were formatted and
partitioned in Gparted. Gparted can't see USB sdh 1 now.
I Did fdisk -l and received below info
Hope someone can help me with this I'm getting dog gone close to
doing video with this system. Pretty Exciting :-)
Doug

Disk /dev/sda: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x028ef790

Device Boot Start End Blocks Id System
/dev/sda1 * 1 23993 192723741 83 Linux
/dev/sda2 23994 24321 2634660 5 Extended
/dev/sda5 23994 24321 2634628+ 82 Linux swap / Solaris

Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x09a43bda

Device Boot Start End Blocks Id System
/dev/sdb1 1 30401 244196001 83 Linux

Disk /dev/sdc: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0009e195

Device Boot Start End Blocks Id System
/dev/sdc1 1 19457 156288321 83 Linux

Disk /dev/sdh: 250.0 GB, 250059349504 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x32ab94cc

Device Boot Start End Blocks Id System
/dev/sdh1 1 30401 244196001 83 Linux