While the external hard drive got damaged and did not detected on computer, after you fixing the problem, you should your data back. We will introduce the best. There is a chance that the drive will not be detected in MHDD. The reason may be the operating mode of the SATA controller (IDE and AHCI) in.

Software: HDD diagnostics and recovery
Wipe My Disks securely wipes all disks installed in your computer. It supportsSATA, IDE, SAS, SCSI or SSD hard disk drives. Will also work with most external driveenclosures as well as SD, MMC, MemoryStick and CompactFlash media. The tool is freeware.
This HDD Raw Copy tool can make an exact duplicate of a SATA, IDE, SAS, SCSIor SSD hard disk drive. Will also work with any USB and FIREWIRE external driveenclosures as well as SD, MMC, MemoryStick and CompactFlash media. The tool is free for home use.
This HDD Low Level Format utility is free for home use. It can erase and Low-Level Format a SATA, IDE, SAS, SCSI or SSD hard disk drive.Will also work with any USB and FIREWIRE external drive enclosuresas well as SD, MMC, MemoryStick and CompactFlash media.
HDD Capacity Restore Tool allows you to restore factory capacity of any hard drive. Acomplete capacity restore guide issupplied with the application.
Partition Find and Mount allows you to recover deleted partitions. What's special in thisprogram is that it allows you to mount lost partitions right into the system, so the operatingsystem sees that lost partition like a good one.

This software also has the possibility to create and mount images of the entire hard drive or separate partitions.

Mhdd Not Detecting Drive
This freeware HDD Wipe utility will erase and re-certify a SATA, IDE or SCSI hard disk drive with any size of upto 281 474 976 710 655 bytes. Will work with USB and FIREWIRE external drive enclosures.Low-level erasing of Flash Cards is supported too. HDD Wipe Tool will clear partitions, MBR, and everybit of user data. The program utilizes Ultra-DMA transfers when possible.
This utility, on the bootable CD, will then examine your system, detect all 2.5/1.8 inch hard drives installed, and then check the firmware revision of the drive.If required, it will prompt you to run the appropriate firmware update program for your drive.
Magic Boot Disk v2.0 is an MS-DOS boot disk which contains some very usefull stuff, such as patched FORMAT.COM, fixed FDISK.EXE, USB Mass Storage drivers for MHDD and more.
USBASPI is a MS-DOS driver makes it possible to access your USB device under MS-DOS.

Supports USB (OHCI/UHCI) and High Speed USB (EHCI) external Mass Storage devices such ashard disk drives, CD/DVD-ROM, flash disks and flash cards attached via card-readers.

HDDScan is a freeware program for low-level HDD diagnostics, it supports IDE/SATA/SCSI hard disk drives, RAID arrays, external USB/Firewire hard disks, flash cards.

The program can scan the surface, view SMART attributes, adjust AAM, APM (Power Management), etc.

IBM/Hitachi Drive Feature Tool is a DOS-bootable tool for changing various ATA features.The Feature Tool allows you to control some of the features of IBM/Hitachi Deskstar and Travelstar highperformance ATA hard disk drives and supports 48-bit addressing, so it will work with the new large capacity drives.
Victoria is a freeware program for low-level HDD diagnostics.

Victoria supports these interfaces: IDE and Serial ATA.

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MHDD is the most popular freeware program for low-level HDD diagnostics.

MHDD supports these interfaces: IDE, Serial ATA, SCSI. Also there is a possibility to access an USB storage, there are drivers for emulation (USB->SCSI).

This software can make precise diagnostic of the mechanical part of a drive, view SMART attributes, perform Low-level format, bad sector repair, different tests and tens of other functions.