Over the years, Iomega external disks have been very popular drives in Ireland for their ease of use and wide variety of capacities. Using a 3.5” or 2.5” form factor, these disks usually come in a brushed aluminum or plastic lacquered enclosure. The 3.5” version such as (MDHDU500) comes with a 12V 2A power adaptor while the 2.5” variants (such as LPHD-UP and RPHD-TG) are USB bus powered. Given their popularity, it’s no surprise that we see a lot of them in our lab for data recovery.
Inaccessible Iomega external disks can show many symptoms including:
- Your Iomega disk appears as “unformatted” in Windows.
- Your Iomega external hard disk is not getting detected by your Windows, Mac or Linux computer.
- When your Iomega disk is connected to a Mac, you receive the message “the disk you inserted was not readable by this computer”.
- Your Iomega external disk will not turn on.
- Your Iomega external disk shows a flashing light, but no data appears.
- Your Iomega disk is making a clicking, buzzing or knocking sound.
- You are presented with an error message about “the parameter is incorrect” or “cyclical redundancy check” when you connect your Iomega disk’s USB cable.
- You can see your files and folders on your Iomega disk but cannot copy them over to another medium.
Or, a specific event may have occurred to your disk which has resulted in it failing such as:
- Your Iomega external disk has suffered a suspected power surge
- Your Iomega external disk got accidentally dropped.
- You accidentally formatted your Iomaga hard disk containing priceless photos.
Recently, we had a customer whose Iomega external disk contained all their work for the last seven years but stopped working unexpectedly. Their 3.5” MDHDU500 Iomega disk failed to be recognised by any of their Windows computers. We opened the enclosure and found a Seagate Barracuda 7200.11 500GB S-ATA disk (ST3500820AS). Our recovery systems indicated that the disk appeared to be in continual “Busy” mode. This means that the disk could no longer receive ATA commands needed for diagnostics or repair. When a disk is in this mode, it’s like trying to call a telephone number, but continually getting the engaged tone. Either the person’s phone is busy or there is a problem with their connection and/or phone. In this case, any ATA commands we issued to the disk to initiate an exit from this very restrictive mode of operation proved fruitless. We did not suspect the disk-heads because platter and head-disk assembly rotation sounded normal. Moreover, we had come across similar problems with this family of disks before. The problem is usually – but not always – rooted in a faulty media-cache. The media-cache in these disks buffers sequential and random writes so they write more smoothly to the disk. (It should not be confused with the media-cache used in SMR disks) However, the media-cache can sometimes go corrupt causing the disk to be unreadable.
Fixing the Iomega External Drive and Recovering its Data.
In order to get the disk to exit “Busy” mode, we had to short the read-channel of the disk. This can be performed by using an anti-ESD tweezers and applying its two tongs to two shorting points on the disk’s PCB. Once this had been completed, we patched the ROM. Patching the ROM is like adding an extension of code onto the existing module allowing our data recovery equipment recognise the drive. This procedure got us a mountable volume again. The media-cache can an be an awkward beast to handle, but having the experience of successfully resolving this problem numerous times made this procedure less daunting. We achieved a 100% data recovery rate – over 450GB of data. We were very surprised to see that the customer was still using FAT32 as their main data storage partition though. (FAT32 should not be used on USB memory sticks let alone disks containing almost half a terabyte of important data…) We extracted his recovered data onto a USB external drive. Another happy customer. Another case closed.
Drive Rescue is based in Dublin, Ireland. We offer an external hard disk data recovery service for Iomega external USB drives which are unrecognisable, which are clicking, which are appearing as “unformatted” or Iomega drives which have been dropped. Common models we recover from include the MDHDU, MDHD500-ue, MDHD320-U, GDHDU2, LDHD-UP, LPHD-UP and Iomega Go 2.5” portable disks such as the RPHD-TG, RPHD-U, RPHD-UG and RPHD-UG3.