My mac laptop suddenly won't recognize it

SOURCE: Macintosh computer not recognizing the LaCie external hard drive

First thing to check is whether the Mac recognises the LaCie hardware. Go to the Apple icon, and select 'About this Mac/Computer' then more info, which will launch System Profiler, check the FireWire section under Hardware to see if your drive is listed. Assuming it is, and that the Disk Utility program doesn't see the drive, then you'll need a Disk analysis program like 'Drive Genius' or a recovery program like 'Disk Warrior'
Should your drive not be seen under the FireWire section, you have an interface failure on the LaCie, which isn't terminal, you'll just need to put the drive in another HD case and then read the data. Reply to this and I'll try and give more help depending on the results you get in System Profiler.

SOURCE: LaCie 1 TB Hard drive won't boot

I lave lots and lots of experience with LaCie Drives (I have 6 of the 2TB models). Every, every, every time a drive fails or runs slowly, it is the power supply. I have now replaced 5. They run very hot (so does the drive), and fail pretty often. It looks like the voltage drops just a smidge, and access times seem to increase, i.e., the drive "runs slow". Then it won't boot at all, and the blue light keeps blinking. Fortunately LaCie has replacement power supplies in the store. Buy a couple extra. I am married to the LaCie drives now, or I would probably switch brands. I kind of guess that they know about this because I contacted the help desk, and he wasn't surprised. Maxtor has a nice drive, and the Calvary drive is $150 cheaper. A drive is a drive I guess. By the way, if anyone is listening, how about building a QUIET, COOL drive with and INTERNAL POWER SUPPLY? GOT IT? All the cords and power supply bricks make me crazy. It might be nice to see a stackable drive where the top of one drive mates to the bottom of another, carrying network info as well as power to the drive above. Hint, hint. We all are building systems with ungodly amounts of storage. Too bad the manufacturers aren't building drives with the durability we need.

SOURCE: LaCie Big Disk 500GB not showing up

1. the usb connector in the PC may have a broken board contact needs soldering or replacement.
2. there may be a broken USB cord to the external usb drive
3. the electronic controller in the USB case may not be working.
4. A new case may be needed with a new controller.

SOURCE: i have a Lacie hard

It's hard to say from your description what the problem is but the first thing to do is determine the condition of the drive. You can check if there are problems with the drive using the free trial version of http://www.hdtune.com/

If the drive is not detected at all you will need a pro data recovery service but if it checks out ok then you can try to recover your data with Recuva it's free http://www.piriform.com/recuva

Or if you need data recovery help this a good choice for low cost and fast data recovery. All data recovery work is performed remotely over the Internet from a boot cd that you download and the best part is they just ask for donations if you are happy with the results: http://FreeDataRecovery.us