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Hard Drive Apple iMac G5 Repair Story

When an Apple iMac G5 locks up on you, it might mean the hard drive is bad. Many folks have contacted me over the years about their Apple iMac G5 problems they have been having because of bad motherboards or power supplies. Well, I thought I would share a story of my own, in regards [...]

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When an Apple iMac G5 locks up on you, it might mean the hard drive is bad.

Many folks have contacted me over the years about their Apple iMac G5 problems they have been having because of bad motherboards or power supplies. Well, I thought I would share a story of my own, in regards to trouble shooting a bad iMac G5, in the hopes that it might help some of the folks out there in Apple iMac Computer land.

I recently picked up a used iMac that was giving the previous owner fits, in that it would eventually, after some time of being turned on, would lock up on them and only show the Apple logo at startup with the little circle going round and round. The fans would start turning at full speed. Once this occurred, the only way to get it back up and running was a fresh load of the software from the DVD disk back on to the hard drive.

Prior to loading the software back on the hard drive, I had gone through the procedure of checking out the capacitors on both the motherboard and the power supply unit, but did not see any signs of capacitor trauma, as in; bulging, leaking, or blown capacitor bodies. When having an iMac G5, it is always wise to begin with a visual inspection of both the motherboard and the PSU. Refer to my write-ups on repairing the Apple iMac G5 motherboard and how to repair an iMac G5 power supply unit for complete details.

I tried resetting the PRAM (Parameter RAM) and also tried resetting the SMC/PMU [System Management Controller (Intel Macs) or Power Management Unit (PowerPC Macs)]. I also tried replacing the PRAM backup battery (Energizer 2032) that retains the small amount of nonvolatile RAM (NVRAM) for the PRAM. This is where the date and computer settings are stored when the computer is turned off. None of this made any difference on my iMac lockup problem. Here is a very good article overview of the PRAM and SMC/PMU failure symptoms and when to reset the PRAM and SMC/PMU.

Well, after repeated hardware tests, with no indications that any hardware was bad (so much for hardware tests), I pulled out the old Maxtor 250 GB hard drive and tried reformatting it externally and backing up one of my other iMacs to this hard drive using a USB connection and an external hard drive adapter. The backup was completed successfully, and I returned the hard drive into the original iMac G5 cassis, and it booted up. Well, this was only a short term success. The iMac locked up when trying to do a software update. I was thinking that the software might be locking up because it was installed on the other iMac and registered on the other iMac. So, once again I took a brand new Leopard software disk family pack, and tried loading it on the hard drive again. No luck on this software load either. It bombed out part way through the loading process and returned to the Apple logo going round and round on startup.

Well, I am not one to let a little Apple logo roadblock stop me from getting to my iMac computer land destination. So out I go to my local Frys store (Frys is a large electronics store on the West Coast and another 8 states) to find out the best deal on a serial ATA hard drive. I didn’t want to spend a fortune, and I wanted to get the best value for the money. I ended up purchasing a Hitachi 640 GB HD for around 70 dollars. I figured I could always use this drive on something else if it didn’t work to fix the problem on this iMac.

So, I brought it home, opened it up, placed the mounting brackets on the new hard drive, mounted it in the iMac, and buttoned the whole computer back up. I then placed the Mac OS X Leopard DVD install disk in the slot, turned it on, held down the “C” key on startup. I then used the disk utility to format and mount the hard drive. Then loaded a fresh installation of OS X Leopard, did the updates, and have been running terrific for three weeks or so with no problems. I even added a “matched set” of PC 3200 1GB memory sticks for a total of 2GB of RAM. Now, I am a bit jealous for my own original iMac G5 computer with Mac OS X Panther installed. I think I will upgrade my other 20 inch iMac G5 to Leopard too. But that is a project for another day, and I am told that you have to do a fresh install too. Which means backing up and transferring the files over to the new installation.

Well, for the time being I am on happy trails to you, until we meet again.

Update to article: 12/25/2010

Just last week, I had another iMac G5 computer with a Seagate Barracuda 7200.7 160 GB hard drive (Apple identification:  160GB C6SER 655-11109D “KA45304C7RT9A)   go out. I went to FRYs again and selected a 1TB Seagate drive (drive only, not boxed) and installed it. I had a problem that it would not show up with the Apple Disk Utility. However, when I used my adapter plug to plug it into a PC, the drive would display. I tried using the jumper to force it to a slower access speed, but it still would not show up in the iMac. I then took this one back and got another brand (Hitachi 500 GB hard drive only, not boxed) from Frys again, but this one was completely dead. It would not spin. It was an old drive that was the last one in stock. I took that one back also, and Frys confirmed that the drive was indeed dead.

However, I did find another Hitachi 660 GB SATA hard drive online at Frys that I did order. When that one came in, it plugged in just fine and showed up with Disk Utility, formatted, and loaded software with no problems.

I believe other manufactured brands internal drives will indeed work with the iMac G5s, I just have not been able to confirm which ones.

Jim Warholic

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What’s On The Computer eCommerce Tap?

When it comes to fixing your Apple iMac G5, I’ve got the repair solutions for you. Do it yourself motherboard repairs. Do it yourself power supply repairs. MOB and PSU capacitors for sale. Specialty screwdrivers and Torx bits for sale. Arctic Silver thermal heat sink compounds for sale for Apple, Intel, AMD CPUs and for [...]

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When it comes to fixing your Apple iMac G5, I’ve got the repair solutions for you.

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Find Apple iMac G5 capacitor kits for mother boards and power supplies available to purchase online. Arctic Silver Thermal Heatsink Compound and computer tools are available too. Apple iMac G5 extra long life (10,000 hours) low ESR Caps.

See What’s on the Computer Tap Today

I’m adding new items for sale on a regular basis at J West Sales eCommerce Store, so check back with me later. In the mean time, if you are looking for something special, or would like to see me carry some other products for sale, let me know, and I’ll see if I can track them down for you. Contact Jim Warholic today.

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FDD Floppy Disk Drive Emulators, Interfaces, and Retrofits

Updated information on the floppy disk drives hardware interfaces and FDD emulators to replace 3.5 inch, 5.25 inch, and 8 inch floppy disk drive units. These devices are not external USB floppy disk drives, but direct floppy disk drive replacements for internal original equipment manufacturers floppy disk drives. In other words, if the OEM computer [...]

Click to read more about: FDD Floppy Disk Drive Emulators, Interfaces, and Retrofits

Updated information on the floppy disk drives hardware interfaces and FDD emulators to replace 3.5 inch, 5.25 inch, and 8 inch floppy disk drive units. These devices are not external USB floppy disk drives, but direct floppy disk drive replacements for internal original equipment manufacturers floppy disk drives. In other words, if the OEM computer has a standard 34 pin floppy disk drive cable, these devices are plug and play. No USB port is required on the OEM computer for the floppy emulators to function. This is follow up information to my first article on the subject: The Floppy Disk Drive Engineering Design Challenge SSD to FDD

Floppy Disk Drives 3 5 8 inch Pictured above from right to left are old legacy 3 1/2, 5 1/4, and 8 inch floppy disk drives which have been installed in OEM computers. The floppy disk drive emulators replace these old legacy floppy disk drives with a simple plug-and-play emulator device. No computer USB ports are required for operation. In fact the three floppy disk drive emulator devices shown below are designed for computers that do not have USB ports.

Readers have been asking for quite some time if I have found out any more information on the FDD SDD interfaces.

How is the FDD SDD interface shaping up?

I would like to see a device in a 3.5″ form factor to fit in existing housings.

It should have a SD slot in the front with a LED or LCD display, up/down buttons and a soft eject/reinsert button, this way you can dial up the appropriate floppy image and then soft-insert it.

Because the FD drive interface uses control signals to physically step the motor and heads, the interface will need an MCU such as a Pic to act as a interpreter between the memory buffer (720k or 1.44k) and the interface. A second MCU should be used to interface the SD card to the memory buffer.

Disk images can be stored in individual folders on the SD card and accessed incrementally.

The unit will also need several hardware switches to emulate the various non-standard formats (i.e.: disk insert notification) adopted by early manufacturers.

Just a couple of thoughts. I think this device has potential to be a very popular eBay item.



In response to those emails, and thank you for sending all those emails to me by-the-way; below is FDD information that I think many engineers and end users will find very useful and some possible solutions to the old legacy floppy disk drives.

Apparently there are a few FDD hardware replacement solutions from companies called “floppy disk drive emulators” for the old floppy disk drives in legacy equipment. In my opinion, they have filled the gap between the old floppy drive legacy machines and the new solid state storage device machines.

Some of the FDD emulator manufacturers are listed below.


Lotharek HxC floppy drive emulators come in a number of different versions. There are SD Card and USB versions in various cased and uncased types. By the way, there is a lot of open source software that can be used to create the virtual floppy disk image on the SD Card or the USB stick to begin with. Once you have the particular type of format for  your type of old floppy disk saved on the SD Card or USB stick then you simply plug the SD Card or USB stick into the emulator, and the process of reading and writing to the virtual floppy disk image is as easy as if it were a real floppy disk. If you have to copy files from floppy disks to the virtual floppy disk emulator, the emulator can be set as Drive 1, or Drive 2, or both. Then you simply copy from one working floppy drive to the virtual floppy emulator.

Here are some up front notes about floppy disk drive emulators that I think are important to note. Not all emulators will emulate all the various types of floppy drives. There are many types of floppy drive formats and floppy drive types. The Lotharek HxC emulators, along with the software that is available, in my opinion allows for the most flexibility with a wide range of applications. In essence, the emulators can be used in Single Sided, Double Side, DSDD, 720KB, 1.4KB, 5¼-inch DD, 5¼-inch HD, 3½-inch DD, 3½-inch HD, Shugart modes, along with a number of others.

- USB version which allows you to connect the floppy disk drive interface of the computer to a PC via a USB cable. For more information on this interface, go to “USB HxC Floppy Drive Emulator” page.

- SD CARD version which allows floppy disk emulation; for which floppy disk images are stored in a SD CARD. For more information about this interface, go to “SD CARD HxC Floppy Drive Emulator” page.

- SD CARD version in precision made black case. For more information about this interface, go to the “SD CARD HxC Floppy Drive Emulator” cased link page.

- SD CARD version in precision made gray case. For more information about this interface, go to the “SD CARD HxC Floppy Drive Emulator” cased link page.

- REV F in 3.5″ standard factor. For more information about interface, go to the “SD CARD HxC Floppy Drive Emulator” REV F link page.

- SLIM VERSION – For more information about this interface, go to the “HXC Slim Floppy Emulator” link page.

If you want to build it yourself, here is the information to build your own USB HxC Floppy Emulator.

ipcas – USB Floppy Emulator 100 in 1

USB Stick Floppy Disk Drive Emulator The USB Floppy Emulator 100 in 1 is from ipcas GmbH, a company located in Germany. The USB Floppy Emulator 100 in 1 device is a direct replacement for the old legacy floppy diskette drives. The connections on the back of this FDD emulator are identical to that of the old floppy disk drives. On the back of this device is the 34-pin socket where the floppy disk drive cable gets plugged in, and the +5 volt DC standard power connection for the floppy drive also plugs in to the back side.

The front side of the device accepts a USB Stick, which acts like the floppy disk, but stores up to 100 virtual floppy disk drives on the USB Stick, with each number representing the virtual floppy disk drive being accessed. Simply select the desired virtual floppy (0-99) with the selection button to choose which virtual floppy you wish to access from the USB Stick front plug in.

According to the USB Floppy Disk Emulator User Manual, “The ipcas Floppy Disk Emulator can also replace other forms of disk drives and disk storage systems. Refer to the comparison with a 5¼ inch floppy disk drive with 1.2 MB floppies.”

Pictured below is the backside view of the ipcas USB Floppy Emulator 100 in 1 device.

Notice on the picture above, the standard 34 pin floppy disk connector and the standard power connector. These connectors are plugged into the existing OEM computers, (where a floppy disk drive would be installed) and the front side is where the USB stick would be inserted.

The beauty of this device is that no driver or configuration software is required to install and operate this floppy disk emulator with old legacy equipment. The manual states, “Many machines and devices are still using floppy disk drives as the only means of data input. CNC, milling, injection mold, or embroidery machines, laser cutting devices and integrated control systems, just to mention a few, are still being fed data with floppy disks several times a day.”

The Next Floppy Disk Emulator Device

PLR Electronics – 3 ½ floppy drive to USB flash drive reader upgrade

USB to Floppy Disk Drive PLR Electronics specializes in the embroidery machine circuit boards. They also have been involved in repairing other circuit board equipment too. PLR Electronics sells the 3½ floppy drive to USB flash drive reader upgrade device. PLR Electronics claims that the device will “work successfully on · CNC Machines · Embroidery Machines · Keyboards · Knitting Machines · Diagnostics Machines · Cutters · Routers · And most any machines with a Floppy Disk Drive.”

The backside of the emulator has the power connection plug and the floppy disk drive cable plug. Simply remove the old floppy drive cable and power connection, and plug it into the FDD emulator. The front side of the device has the USB Flash Drive Port, a File Chooser Connector Port, and even a Network port connection to another computer. The file chooser provides a means of selecting which files on the USB Flash Drive you wish to choose.

There are a number of modes of operation. SFDR-1, SFDR-II (SFDR-1 + File Chooser),  plus other modes of operation:

We request that you inform us on the original floppy drive type when placing an order to avoid mismatching the drive type. For example:

  • SFDR-I-I————–Universal IBM type
  • SFDR-I-A————-YD-6639D, TEAC235FG
  • SFDR-I-B————-NEC 1137C
  • SFDR-I-C————-YD-6037D

The picture below shows how the Floppy Drive Emulator from PLR Electronics would be installed.

Installation Instructions:

To install your 3 1?2 floppy to USB Flash Reader, with the device powered off and unplugged, simply remove the existing drive from its existing cradle. Disconnect existing ribbon cable and power cable from existing drive. Reattach existing power cable and ribbon cable to the USB Flash Reader. Insert USB Flash Reader into existing 3 1?2 floppy cradle and reattach all hardware. Your device is now ready to use. If any existing configuration is required on your system, please use all standard settings for a 3 1?2 floppy drive as detailed in your devices user manual.

Once the floppy emulator is installed, you then can use any USB Flash Stick as your floppy drive. In other words, you use a portable USB stick as the floppy. The original floppy cable plugs directly into the floppy emulator. These are not external USB floppy drives.

I would also imagine (though I have not confirmed) that if there were two floppy drives on the OEM equipment to begin with, you could hook up one of these devices and copy from one of the original floppy drives to the new emulated floppy drive onto a USB stick.

This is a plug and play device also. The 3½ floppy drive to USB flash drive reader manual provides some Frequently Asked Questions that are very informative.

Frequently Asked Questions

- Q – Will this device work with a Windows NT operating system?
A – YES. This device should work with any OS assuming it is capable of working with IBM type floppies.
- Q – Will the 3 1/2 floppy to USB drive work in a XXXXXXXXX that can only read 720k 3 1/2 floppies?
A – Yes
- Q – We have XXXXXXX machines here and the floppy disk is 720K. IF we put a 1.44k in the machine the floppy drive does not work. Do you have a 720K mode on your device? T
A – Yes
- Q – Hi I am presently using a XXXXXXX keyboard which uses floppy disks on which I play my music files. Can this flash drive reader be used in my case?
A – Yes it will.
- Q – Hi, I currently have a floppy disk drive that is half the height of a standard drive. How can I modify this to work?
A – You do not need to modify anything. We offer a laptop height version. Please ask for this version when placing your order.
- Q – Is it USB 2.0?
A – No, its standard USB. However, USB 2.0 is used primarily for high speed data transfer. In this instance, the files you are using are very small so, there will be no noticeable difference.

C. On to the next storage systems emulators for replacing floppy disk drive units.

Data Storage DTX-200 Floppy Disk Drive Emulator

datex_dtx200Datex, located in France, sells the Datastorage, storage systems emulators to replace legacy disk drives, such as Fujitsu MK2322, Control Data FSD515, Ampex, Maxtor XT1140, as well as tape drives. Datex manufactures  the DTX-200 Floppy Disk Drive Emulator. The DTX-200 is designed for directly replacing 3 1/2, 5 1/4, and 8 inch floppy disk drive units.

There are numerous options available for the Datastorage DTX200. Compact Flash cards or USB keys can be used to store data on. A floppy disk adapter card is designed specifically for the specific connection technology to directly replace each of the specific types and manufacturers model floppy disk drives.

The DTX-200 Floppy Disk Drive Emulator documentation states the following:

The DTX 200 can replace all the floppy disk drives, for example:

  • 5 1/4” DRIVES:
    • Full height: SHUGART SA400, MPI 92S, TANDON TM100, …
    • Semi-height: TEAC : FD-05xx, FD-55xx, FD-235xx, EPSON : SD-681L, …
  • 3 1/2” DRIVES: ALPS: AL FD 7xx, PANASONIC: JU-25xxx, SONY: MPF-520xx, MPF-920xx, …
    And all other Floppy disk drives…

The Datastorage DTX200 is designed to fit in the space of a 3.5 inch floppy drive. Apparently it is pre-programmed to have the same features as the floppy drive being replaced. It is designed to hold information on a CF (Compact Flash Memory Card), or a USB key and is designed to be used in numerous applications such as: cash registers, robots, planes, boats, and submarines. A press release, Datex Designed a Floppy Disk Drive Emulator, dated January 5th, 2009, stated that “this DTX200 emulator has already been installed in Japan and Taiwan, as well as in the French RATP.”

What do these Floppy Disk Drive Emulators Cost?

The cost of these Floppy Disk Drive Emulators vary considerably. At this time, I am not going to post the individual prices, because they are probably changing as I write this. The FDD Emulators go from approximately 275 USD to 1,100 USD and the cost could be more expensive depending on the added options. The links are there to the companies and the emulators in this article to compare the costs yourself.

Which one is best for your application?

There are pros and cons to each of the above floppy disk drive emulators. Some have more options than others. Certainly some of them are significantly more expensive than others, but that is not the only criteria that should be used in the evaluation process. Since I have not tried any of these emulators out myself, I feel I can not give you an honest analysis of which FDD emulator I would recommend.

If anyone does decide to use any of these floppy disk drive replacement emulators, I would sure like to get your feedback on how well they worked for you.

A reader was kind enough to post the following information in the comments section, but I wanted to post it here in case the URL hyperlinks change:

Here a complete list of the available floppy usb emulators:

Thank you for your comments.

Fell free to send me an email, and/or post additional comments online here too.

Jim Warholic

Jim Warholic is an Internet marketer, with a background in electronics, engineering, printed circuit boards, technology, marketing, advertising, and sales. Jim is President of Professional Web Services, Inc., an Internet marketing company located in the San Francisco Bay Area; specializing in Internet marketing, SEO (Search Engine Optimization), SEM (Search Engine Marketing) online advertising, PPC (Pay Per Click advertising campaign management), SMM (Social Media Marketing) and SMM (Social Media Optimization), web branding, eCommerce solutions, and sales and marketing solutions for businesses in both the B2B and B2C market sectors.

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