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Ran the analyze feature and 3 partitions showed up. The info looked accurate (I'm working on someone else's drive) Had the Dell part, Recovery, and System partitions all in RAW fs. I changed the Dell to DE per instructions then ran the deep scan. The scan came back with nothing at all. I ran analyze again and I have a tiny partition and nothing else.

Did I miss something? Am I hosed and the drive is now toast? Any help would be greatly appreciated.

If you do not write the new partition table, changing the partition type is useless.
Can you post the testdisk.log file content ?

Thanks for the reply Christophe, If I knew where it was I could. I'm running off the TRK USB stick. The last thing I saw was "log file corrupt". It's not looking good is it?
When it showed the partitions I did write down the CHS values for all three listed. I guess I should have stopped while I was ahead. Don't want to make any moves to avoid any further loss or damage.

If you can't provide the log file, try to post screenshots...

Christophe, I was able to finally get a log file. Also have the backup file. Does getting the I/O error indicate a head or control board issue or am I just missing something still? Thanks for your input and the work you have put into this project.

Backup:
#1479660884 Disk /dev/sdd - 500 GB / 465 GiB - CHS 60801 255 63
1 : start= 63, size= 80262, Id=DE, P
2 : start= 81920, size= 30720000, Id=07, P
3 : start= 30801920, size=945969200, Id=07, *

I also have the start and end points written down from one of the screens I got early on. If that is needed I can put it together on here.

TestDisk:Mon Nov 21 19:56:07 2016
Command line: TestDisk

TestDisk 7.1-WIP, Data Recovery Utility, August 2016
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org
OS: Windows XP SP2
Compiler: GCC 5.4, Cygwin32 2005.2
ext2fs lib: 1.43.1, ntfs lib: 10:0:0, reiserfs lib: none, ewf lib: 20140608, curses lib: ncurses 6.0
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(/dev/sda)=80000000000
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(/dev/sdb)=500107862016
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive0)=80000000000
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive1)=500107862016
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\C:)=74932300800
filewin32_getfilesize(\\.\D:) GetFileSize err Incorrect function.

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

Warning: can't get size for \\.\D:
filewin32_getfilesize(\\.\E:) GetFileSize err Incorrect function.

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

Warning: can't get size for \\.\E:
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\H:)=15728640000
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\I:)=484336230400
Hard disk list
Disk /dev/sda - 80 GB / 74 GiB - CHS 9726 255 63, sector size=512 - Maxtor 6Y080M0, S/N:325934313258434d202020202020202020202020, FW:YAR51HW0
Disk /dev/sdb - 500 GB / 465 GiB - CHS 60801 255 63, sector size=512 - ST3500620AS, FW:DE13

Partition table type defaults to Intel
Disk /dev/sdb - 500 GB / 465 GiB - ST3500620AS
Partition table type: Intel

Interface Advanced

Analyse Disk /dev/sdb - 500 GB / 465 GiB - CHS 60801 255 63
Current partition structure:

Partition: Read error

search_part()
Disk /dev/sdb - 500 GB / 465 GiB - CHS 60801 255 63
file_pread(5,16,buffer,32(0/0/33)) ReadFile The request could not be performed because of an I/O device error.

file_pread(5,3,buffer,48(0/0/49)) ReadFile The request could not be performed because of an I/O device error.

file_pread(5,3,buffer,95(0/1/33)) ReadFile The request could not be performed because of an I/O device error.

file_pread(5,8,buffer,111(0/1/49)) ReadFile The request could not be performed because of an I/O device error.

* Truncated to keep post small

The disk is correctly identified but all read operations failed, it's probably a damaged head. You will have to contact a data recovery company.