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Hi recently my External disk is not showing up in explorer . when check in windows disk management it is showing as un initialized . but i have lot important data. i run test disk but it is not showing my hard disk in start screen

screen shot is attached
image 1 and logs is showing as fallows

at Aug 3 11:47:38 2013
Command line: TestDisk

TestDisk 6.14, Data Recovery Utility, July 2013
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org
OS: Windows WorkStation 6.2.9200
Compiler: GCC 4.7, Cygwin 1007.17
Compilation date: 2013-07-30T14:08:52
ext2fs lib: 1.42.2, ntfs lib: 10:0:0, reiserfs lib: 0.3.1-rc8, ewf lib: 20120504
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(/dev/sda)=250059350016
filewin32_getfilesize(/dev/sdb) GetFileSize err Incorrect function.

filewin32_setfilepointer(/dev/sdb) SetFilePointer err Incorrect function.

Warning: can't get size for Disk /dev/sdb - 0 B - 1 sectors, sector size=512 - WD My Passport 0748
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive0)=250059350016
filewin32_getfilesize(\\.\PhysicalDrive1) GetFileSize err Incorrect function.

filewin32_setfilepointer(\\.\PhysicalDrive1) SetFilePointer err Incorrect function.

Warning: can't get size for \\.\PhysicalDrive1
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\C:)=69794267136
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\D:)=179894747136
filewin32_getfilesize(\\.\F:) GetFileSize err Incorrect function.

filewin32_setfilepointer(\\.\F:) SetFilePointer err Incorrect function.

Warning: can't get size for \\.\F:
Hard disk list
Disk /dev/sda - 250 GB / 232 GiB - CHS 30401 255 63, sector size=512 - WDC WD2500BEVS-75UST0, S/N:WD-WXE608LY1238, FW:01.01A01


TestDisk exited normally.


some one please help me to recover my data