Seagate external hardrive not recognised by Imac after wakeup / start up

Hello,
I use this seagate external 1tb driver / mac version silver/ for the time machine
and almost every time I startup my Imac seagate will not start with it or show in finder, unless
I unplug the firewire and plug it back again.
I tried to find a solution on the net but no result, actually I don't even know how to look up this issue on google.
I would appreciate if someone could help me with how to fix that.
Many thx in advance
and Merry Christmas to you all

Is this the type of enclosure that power on and off automatically, based on the state of the Mac (no need to flip a switch)?
Does it also have a USB connection on it? If so, if you connect by USB 2.0, does it have this same problem?
Did it work properly before and recently stopped working, or did it aways have this problem?

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Seagate external drive not recognised

I've had this external Seagate hard drive since I got the Mac itself - around 2 years ago. It's worked fine up to yesterday, when it started making horrible noises, and today when I switched on the Mac it told me 'the disk you inserted was not readable by this computer'. I've tried taking out & re-inserting the USB cable, but I fear something more serious has happened. I looked at another thread on this issue here, but it was full of very technical jargon, & photos someone had taken of the hard drive in pieces; I really don't feel competent to take my drive apart to find out what is wrong! I looked in 'Disk Utility', but I have a second Seagate drive which is the Time Machine back-up, so I'm not very sure which drive I am looking at in there. Everything was greyed out anyway, so I could not click on 'repair' or any of the other options. I would be grateful for any ideas or suggestions!

Thanks; I tried this, & the hard drive is 'seen' by Disk Utility, but not by Finder. See screenshot attached; it's the 'Go Flex' drive I've highlighted. However I can't actually do anything with it in Disk Utility, as all the options to 'verify', 'repair' etc are greyed out. NB: This is the same for the Time Machine back-up drive as well though; no options to do anything.
I contacted the Seagate support but I guess there's nothing much they can do if it's died. Yes I do have the files elsewhere; but mostly on DVD & very time-consuming to access. & if you're using a supposedly 'reliable' hard drive as your back-up disk then you don't expect it to suddenly collapse after just 2-3 years. This makes me worried about the Seagate drive I'm using as my main back-up!

External hardrive not workon on MacBook Pro

I own a Seagate FreeAgent GoFlex that is 1TB and have had it for about 3 or 4 years. I used to be able to plug it in and with ease insert files (pictures, music, documents, etc .. basically everything in case my MacBook stops functioning.)
Back in May, I took my external hardrive to my University before I graduated and I could not insert some video files (using another computer, which was a Mac.) Our school's tech expert said it was because my external hardrive is not applicable with Macs. Long story short, I showed him I can do it on my MacBook Pro, then I had to save my video files on a flash drive instead. Anyway.
I want to back up everything incase the MacBook stops working soon (it's six years old.) However, when I put in my external hardrive, I can't change the name of files/folders in the external hardrive nor can I insert anything into the hardrive. Oddly enough, I can drag stuff into my desktop and it will copy a file into my desktop while the same file still stays on my hardrive.
My MacBook Pro is Version 10.9.5 (if it matters) and I have more than 90 GB of free space on my MacBook and have nearly 700 GB of free space on my external hardrive and obviously I'd like to use that. Also, I'd like to use my external hardrive not just on Macs, but all machines in case I need to save large files. I used to be able to do this at one point, especially with a previously owned hardrive (it was Western Digital.)
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Chiefsfan212006 wrote:
Back in May, I took my external hardrive to my University before I graduated and I could not insert some video files (using another computer, which was a Mac.) Our school's tech expert said it was because my external hardrive is not applicable with Macs. Long story short, I showed him I can do it on my MacBook Pro, then I had to save my video files on a flash drive instead. Anyway.
I meant to also say that your school's tech expert does not appear to be much of an expert.

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- Tr resetting the SMC and PRAM
- If you purchased the Mac within the last 90 days you still have free telephone support
Complimentary Support (USA)

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i have my external hardrive i use with my pc
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If you have an Intel Mac do this:
Extended Hard Drive Preparation
1. Open Disk Utility in your Utilities folder.
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FAT32 (File Allocation Table)
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NTFS (Windows NT File System)
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HFS+ ((((MAC FORMAT)))) (Hierarchical File System, a.k.a. Mac OS Extended (Journaled) Don't use case-sensitive)
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To Read HFS+ (but not Write) from Windows, Install HFSExplorer
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EXFAT (FAT64)
Supported in Mac OS X only in 10.6.5 or later.
Not all Windows versions support exFAT.
exFAT (Extended File Allocation Table)
AirPort Extreme (802.11n) and Time Capsule do not support exFAT
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Maximum volume size: 64 ZiB
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External harddrive not recognised preferences are set up good

HI can someone please help me ??
I have an MAcbook pro:
Processor 2,6 GHz Intel Core i7
Memory 8 GB 1600 MHz DDR3
Graphics Intel HD Graphics 4000
Software OS X 10.9.3 (13D65)
I have an external hardrive and I could always move, change files too it. But as of today it wont show up anywhere. Not in the sidbar and not on my desktop.
All finder preferences are set up well. The harddrive does show up on my moms computer (windows, ugh) An small usb stick does show up, it also recognises my Canon5d mark II. But the hardrive will not appear. PLEase help me...im getting frustrated as i cant make this work. Im abroad frm my own country and really have to make this work as i store my photo's to my drive..... I dont have an 2nd hardrive as my mac and this hardrive are at my holiday adress the redundancy.
I hope you know what software i have....as i just copy past this from my info (aboutthis mac) not sure mavericks or mountain lion
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HI sorry thats what I ment. The disk utility(application) in the folder utilities. The strange thing is that Yesterday the hard drive did apear there. I thought maybe it has something to do with NTFS application. As before I had installed this I could only read but notwrite to files on the hard disks. So I uninstalled and reinstalled the software,,,,,now the hard disk does not appear anymore in disk utilities .....I'm getting futher away from an solution .... :-( what can this be ? ever heard of an problem like this ? I thank you in advance for taking your time to look into this problem.
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Terrence
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I've looked through the posts here and haven't found this issue addressed specifically, so here goes. Any help will be appreciated.
I ran the firmware update on my MacBook Pro the other day, and everything has been normal since, except when I went to switch on my Seagate external HD - which I use as a backup drive - this morning. The mac doesn't see it at all.
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Thanks kaz-k,
/dev/disk0
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   0:      GUID_partition_scheme                        *750.2 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            749.3 GB   disk0s2
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/dev/disk1
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Seagate external hardrive not recognised by Imac after wakeup / start up

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