Seagate Barracuda 7200 160gb Won't Mount

I have a Seagate Barracuda 7200 160gb from a PowerMac G5. It spins up just fine. Sounds normal but is not mounting. I have used a Manhattan USB Dock, A Universal USB Drive Adapter. I had it mounted once externally and ran Disk Repair on it, and it still would not mount in the G5. I even took it to a local data recovery shop and they can't see it either. I've read a lot online about possibly replacing the PDB Circuit Board or the BIOS chip. I've also ran Disk Warrior - doesn't see it.
Is there a way to check what is actually the issue? BIOS, Board, Corrupted OS, etc.?
Tomorrow I'm calling Seagate to see if they can do anything. Basically I'm trying to get the data off of it for someone, then get a new drive and install then migrate assist if possible.
Thanks for any help

why would I need another drive.
To scavenge the board.
You can't just slap any old board on there.
The same model and the same firmware are the general requirements for board swaps to gain access to data....
Why would it need this?
The data rate limit is needed on retail drives to allow proper communication with the G5 controller.
The G5 controller and Seagate retail drives have a nasty history. One, the limit jumper is needed, but NCQ was enabled by default, and later, so was SSC. Neither of these features is compatible with the G5 controller.
It is the drive that was shipped with it when he bought it brand new from Apple.
Hmmm, my ESP wasn't working as well as it usually does.....
If the drive is OEM Apple shipped, then it has Apple firmware which changes jumper requirements.

Similar Messages

Cloning WinXP onto Seagate Barracuda 7200.10 SATA hard disk

Greetings everybody!
I recently wanted to clone my existing (perfectly working) Windows XP Home boot hard disk onto a brand new 320 GB Seagate Barracuda 7200.10 SATA drive, model ST3320620AS. The existing boot C-disk is a 250 GB Western Digital SATA, which is in my Fujitsu Siemens Scaleo P (the CPU being an AMD Athlon 64 3700+). The motherboard is an ASUS A8NE-FM with the SATA interface being a NVIDIA nForce4 Serial ATA Controller.
I struggled quite a bit getting the cloned Seagate SATA disk to work as a Windows XP boot drive, but eventually got it working – using Acronis True Image Home version 9, build 3.854 (http://www.acronis.com/). Here’s how I eventually succeeded; hope it may be useful to others! ( - and I of course realize that ASUS motherboards are not made by MSI, but at the same time I have seen several MSI-users reporting similar difficulties…).
A small hint: You may download, at no cost, a full-functioning version of “Acronis True Image 10 Home”, usable for a 15 days trial period (http://www.acronis.com/homecomputing/download/trueimage/). If you can manage to clone your hard disk within this period, well, it’ll be completely free! A free Windows XP clone utility, which I don’t know how well functions, is XXclone, see http://xxclone.com/.
Here’s how I did (there may be other ways, but, well, this worked for me):
1) First mounted the Seagate ST3320620AS as the D-drive (the C-drive being the Western Digital boot drive). Kept Seagate factory-default jumper setting (“Limit data transfer rate to 1.5 Gbits per second “). Booted up, went into the BIOS (being Nvidia 42302e31 Phoenix AwardBIOS v6.00PG according to ”System Info for Windows” from http://www.gtopala.com/ ), and configured the Seagate drive as follows: Second Master SATA HDD, Extended IDE Drive: Auto, Access Mode: Large (NB: Do NOT select ”Auto” here!!), Capacity: 320 GB, Cylinder: 4095, Head: 240, Precomp: 0, Landing Zone: 65534, Sector: 255. Save configuration and exit BIOS.
2) Booted up on the old Western Digital C-drive. Used Seagate’s DiscWizard to format and partition the ST3320620AS (http://www.seagate.com/www/en-us/support/downloads/discwizard). The drive was formatted NTFS (4k block size, and one single partition). This went smooth (Windows XP however complained of some of the Seagate drivers not being ”WHQL certified” – just continued, anyway). Then right-clicked on ”My Computer" --> "Manage" --> ”Computer Management” --> ”Disk Management”. Right-clicked on the Seagate disk, then clicked ”Mark Partition as Active”. The Seagate drive is now seen in Windows as drive D, and is ready for use.
3) Ran Acronis True Image Home ver. 9, build 3.854 and cloned the Western Digital disk onto the Seagate. This went smooth and took less than five minutes (data amount on the Western Digital C-drive, containing Windows XP Home, \Program Files, \Documents and Settings and not much else, being approx. 10 GB). Impressing fast cloning! Exit and shut-down.
4) Removed the Western Digital drive from the PC, keeping only the new Seagate disk. Booted, went into BIOS, configured the boot drive as the Seagate: First or Second Master SATA HDD (according to what SATA cable is being used), Extended IDE Drive: Auto, Access Mode: Large (NB: Do NOT select ”Auto” here!!), Capacity: 320 GB, Cylinder: 4095, Head: 240, Precomp: 0, Landing Zone: 65534, Sector: 255. Save and exit BIOS.
5) Booted into Windows XP Home on the newly cloned Seagate SATA drive. Success!! End of story!
THANKS to several of ASUS forum users help!
Best regards,
Johan
Copenhagen
Denmark
NOTE the there seems to be an error in some of the ASUS motherboards (or in the BIOS?), incl. the A8NE-FM, which makes it impossible to boot from an apparently successfully Windows XP cloned Seagate SATA drive unless first having set the ”Access Mode” in the BIOS to ”Large” before formatting and cloning. Some also claim that NCQ for the Seagate drive must be disabled; I have not done this and the cloned drive boots and works perfectly with NCQ enabled. (NB: If not setting ”Access Mode” to ”Large”, but if keeping the default BIOS setting of ”Auto”, then it is perfectly possible to both format, partition, set active and clone onto the drive. When attempting to boot using the cloned drive one gets this message: ”Error loading operating system” (or in Danish: ”Fejl ved indlæsning af operativsystem”). Further links discussing this issue:
SATA boot problem: http://vip.asus.com/forum/view.aspx?id=20060822025446574&board_id=1&model=A8N-E&page=1&SLanguage=en-us
Cannot boot from SATA drive: http://vip.asus.com/forum/view.aspx?id=20061109224813953&board_id=1&model=A8N-E&page=1&SLanguage=en-us
Problem with installing XP on 320 GB HDD: http://vip.asus.com/forum/view.aspx?id=20060622193708298&board_id=1&model=A8N-E&page=1&SLanguage=en-us
Seagate SATAII disk unable to boot: http://vip.asus.com/forum/view.aspx?id=20060518000042851&board_id=1&model=A8N-E&page=1&SLanguage=en-us
A8N-E, SATA and XP Professional Installation: http://vip.asus.com/forum/view.aspx?id=20060327192440824&board_id=1&model=A8N-E&page=1&SLanguage=en-us

"NOTE the there seems to be an error in some of the ASUS motherboards (or in the BIOS?), incl. the A8NE-FM, which makes it impossible to boot from an apparently successfully Windows XP cloned Seagate SATA drive unless first having set the ”Access Mode” in the BIOS to ”Large” before formatting and cloning. Some also claim that NCQ for the Seagate drive must be disabled; I have not done this and the cloned drive boots and works perfectly with NCQ enabled. (NB: If not setting ”Access Mode” to ”Large”, but if keeping the default BIOS setting of ”Auto”, then it is perfectly possible to both format, partition, set active and clone onto the drive. When attempting to boot using the cloned drive one gets this message: ”Error loading operating system” (or in Danish: ”Fejl ved indlæsning af operativsystem”). Further links discussing this issue:"
that links are useless(for MSI owners), its described bug into BIOS which cannot determinate property HDD access mode. its specified problem related to this Asus board and specific BIOS version. exactly same problem happend and arrive with Gigabyte board after update BIOS to the latest one which suppose to fix "some things" and totally unexpected in background comes this issue..... seems some of Asus BIOSes got same issue...
MSI boards doesn't have this issue in any BIOS version.

MSI K8N Neo4-F + Seagate Barracuda 7200.7 120Gb PATA = PIO

If I have the two above components together, and enable DMA in the BIOS, the system won't boot. I have to disable DMA to get the system to boot, but then transfer speeds are excruciating!
Suggestions? Can't be a driver issue as I get this problem even before an OS is installed.
K8N Neo4-F (non SLI edition) [BIOS v1.6]
Athlon 64 3700+
PC3200 Crucial 1Gb (2x512Mb sticks in dual channel)
BFG 7800GT OC 256Mb
Creative X-Fi Fatality FPS
Seagate Barracuda 7200.7 120Gb (EIDE) [ST3120026A]
Seasonic S12 500W PSU
XP Pro

Bump

Seagate Barracuda 7200.1 500GB 7200RPM S300 32MB

Will the:
Seagate Barracuda 7200.1 500GB 7200RPM S300 32MB
be compatible in my
2 x 2.66GHz Dual-Core Intel Xeon Mac Pro
I noticed that my machine has a Seagate Baraacude 250GB drive in so I assumed this would also work.
Do I need to purchase additional SATA cables or do these drives plug directly into the motherboard of the MacPro?

Yes, it will work. Installation information is in the Mac Pro User Guide manual that came with your computer. Page 38, I believe.

IMAC 2010 which HDD can I use to replace the malfunctioned Seagate Barracuda 7200.12 1TB?

iMAC 2010 which HDD can I use to replace the malfunctioned Seagate Barracuda 7200.12 1TB?

After doing a bit more research, the 2010 iMacs do appear to have a third cable connecting to the hard drive, for the internal temp sensor. This would appear to be the block of 8 pins that are on almost all drives, but they are normally intended for jumpers. Unfortunately I was unable to find any documentation or specs that would indicate this pin block connects to the internal temp sensor on either standard (non-Apple) WD Black or Seagate 7200.12 drives.
I did find some info that may be of some use:
WD: Where to connect an external temperature sensor to a Serial ATA or EIDE hard drive.iFixit: Replace the hard drive, how do I connect the hard drive thermal sensor?
Apple Technician Guide: iMac 2010 27" (mid-2010)
Various discussion threads I found through google searching indicated some people succeeded with installing an external temp sensor on the body of the drive.
Sorry I couldn't help more.

Seagate Barracuda 7200.11 or ES.2 for RAID 5

Hello all.
I've searched through past topics to avoid repetition, and my knowledge of RAID is somewhat limited. Nonetheless.....
I've purchased a Mac Pro 2x Quad Core for the audio company that I work for, and plan to fill up the hard drives with an extensive audio library which will be accessed via Logic Studio.
We are planning on purchasing a RAID card, using RAID 5 in order to stripe and mirror the drives.
The hard drives we are looking at are Seagate Barracuda 1TB drives, and I am struggling to determine which will be most appropriate.
Having researched around, it was suggested to me that the Seagate Barracuda ES.2 drives are more appropriate for using with a RAID card, although considering the increased cost compared to the 7200.11 drives [an extra £180), I'd like to find out is this is really necessary.
If any of you have any advice, suggestions, etc., I would be most grateful.
Louise.

If you are in an enterprise in which these drives will be in relatively continuous use, then it would be wise to purchase the ES enterprise models because they are intended for heavy enterprise usage. If all you do is an occasional backup to the RAID and the usage is light and the drives are not running 24/7, then you may do fine with the less expensive versions.
Here is some information and additional links to help you learn more about RAIDs.
RAID Basics
For basic definitions and discussion of what a RAID is and the different types of RAIDs see RAIDs. Additional discussions plus advantages and disadvantages of RAIDs and different RAID arrays see:
RAID Tutorial;
RAID Array and Server: Hardware and Service Comparison>.
Hardware or Software RAID?
RAID Hardware Vs RAID Software - What is your best option?
RAID is a method of combining multiple disk drives into a single entity in order to improve the overall performance and reliability of your system. The different options for combining the disks are referred to as RAID levels. There are several different levels of RAID available depending on the needs of your system. One of the options available to you is whether you should use a Hardware RAID solution or a Software RAID solution.
RAID Hardware is always a disk controller to which you can cable up the disk drives. RAID Software is a set of kernel modules coupled together with management utilities that implement RAID in Software and require no additional hardware.
Pros and cons
Software RAID is more flexible than Hardware RAID. Software RAID is also considerably less expensive. On the other hand, a Software RAID system requires more CPU cycles and power to run well than a comparable Hardware RAID System. Also, because Software RAID operates on a partition by partition basis where a number of individual disk partitions are grouped together as opposed to Hardware RAID systems which generally group together entire disk drives, Software RAID tends be slightly more complicated to run. This is because it has more available configurations and options. An added benefit to the slightly more expensive Hardware RAID solution is that many Hardware RAID systems incorporate features that are specialized for optimizing the performance of your system.
For more detailed information on the differences between Software RAID and Hardware RAID you may want to read: Hardware RAID vs. Software RAID: Which Implementation is Best for my Application?

Seagate Barracuda 7200.8 Hard drive

In a Presario SR1817CL with Windows XP and 512MB memory, the Seagate 200GB 7200.8 hardrive is erratic, can't open desktop. Have a 500GB 7200.11 available to replace it. Will my PC support it and will I need any other changes?

Hibbs wrote:
In a Presario SR1817CL with Windows XP and 512MB memory, the Seagate 200GB 7200.8 hardrive is erratic, can't open desktop. Have a 500GB 7200.11 available to replace it. Will my PC support it and will I need any other changes?
The Presario is a desktop so a 500GB SATA hard drive should work..
Dv6-7000 /Full HD/Core i5-3360M/GF 650M/Corsair 8GB/Intel 7260AC/Samsung Pro 256GB
Testing - HP 15-p000
HP Touchpad provided by HP
Currently on Debian Wheeze
*Please, help other users with the same issue by marking your solved topics as "Accept as Solution"*

Seagate 3TB Go Flex won't mount

Its a Thunderbolt adaptor desk drive paritioned into 16 partitions. It mounts fine on my iMac 10.7.5, 3.4 GHz, but when I switch it to my MacBook Pro, 10.8.2, 2.6 GHz, it won't mount. Error message says its unreadable. But it does appear as "connected" in the System Profiler, and appears as one disk icon in Disk Utility, but not the 16 partitions.

Hmm, I followed the suggestion, but it didn't resolve it. I ran Disk Utility reapir off the iMac and there weren't any errors found on the drive. When I switch the GoFlex to the MacBook Pro, it appears in Disk Utility as the main drive, but no mounted partitions yet, same issue. And I can't do any repairs to that drive icon in Disk Utility from the laptop.
Any other ideas?

External Hard Drive (160GB) won't mount?!

Hi focus,
I am new in MAC OS and I had some difficult to MOUNT my External HARD Drive in MAC OS TIGER 10.4.10 (all updated).
My MAC simply does not recognized my external HD, but recognize when I am using a Virtual machine (Fusion VMware) and running Windows XP. I already try to format in differents formats, FAT/FAT32/NTFS/EXT2 but nether recognize them.
So I ask, there is some "restriction" to mount external IDE drives? I try to use disk utility or ipartition or SupperDuper and no one recognize automaticly.
My original HD was partioned in 2 parts (by me) one for the system 38 GBs and other one 79 GBs for my musics and documents.
If someone has any ideias why this is happen, please help me to solve this problem. Because I need to backup all my data (no actually bootable stuffs) in this external.
Thanks,

Thanks A Brody,
But how can I format my External HD if my MAC can not recognize, even in disk util or ipartition. I think the partition Magic (for windows) can do that, but can not.
So I think, now, the Mediafour MacDrive can do that, is that real? I am Downloading one version from web and I will try in a second. For me is not a problem format in mac format and read in windows within this software, but the problem is recgnize to format in macformat.
I run windows in virtual machine and now I already Install this Macdrive, but does not work, I can not format my external drive with this software. Well I read more and more discussing foruns and also saw you tube videos about formating in mac and it is not a big deal, its should be easy, first of all if mount my external drive to just starting talking about that stuff.
I will get some other "interface" more modern and try to recognize, if do so, maybe I bougth other USB interface. But for now It is to hard stuff has an external 160GB harddrive to backup stuffs.
Thanks and if some one has other suggestion it is always welcome!

Seagate 500GB External HD won't mount-help!

My external Seagate FreeAgent 500 GB hard drive changed its partition type to nothing. . .
here is what it looks like in Terminal:
imac-users-imac:~ imacuser$ diskutil info /dev/disk4
   Device Node:        /dev/disk4
   Device Identifier: disk4
   Mount Point:
   Volume Name:
   Partition Type:
   Bootable:           Not bootable
   Media Type:         Generic
   Protocol:           USB
   SMART Status:       Not Supported
   Total Size:         465.8 GB
   Free Space:         0.0 B
   Read Only:          No
   Ejectable:          Yes
   OS 9 Drivers:       No
   Low Level Format:   Not Supported
By contrast, one of the internal drives looks like this:
imac-users-imac:~ imacuser$ diskutil info /dev/disk2
   Device Node:        /dev/disk2
   Device Identifier: disk2
   Mount Point:
   Volume Name:
   Partition Type:     Apple_partition_scheme
   Bootable:           Not bootable
   Media Type:         Generic
   Protocol:           ATA
   SMART Status:       Verified
   Total Size:         25.5 GB
   Free Space:         0.0 B
   Read Only:          No
   Ejectable:          No
   OS 9 Drivers:       Yes
   Low Level Format:   Not Supported
Any help is appreciated. I know I should have been backing up this drive.
I have over 10 years' worth of freelance work, plus 100s of reference photos,
websites, resumes, portfolios on it. I have been exploring testdisk, photorec,
Data rescue, Disk Utility (which sees the drive, and gives me this message:
Verifying volume “disk4s2”
Error: The underlying task reported failure on exit
1 non HFS volume checked
Volume needs repair
The thing is, I have searched for individual files, and I can see the paths to them. However, I cannot mount them or send them
to another drive. I also receive this message in Terminal:
Error (-9958) encountered attempting to verify/repair disk4
Message was edited by: Michael Brugh, spelling correction

Your filesystem appears to be damaged beyond what Apple's Disk Utility is willing to repair.
Frankly it's insane to have one copy of 10 years worth of files you think are important, with that out of the way.
If you really need the data and want it back with the most likely chance of success of reading it all stop using it right now and contact a drive recovery company. They have the knowledge & expertise that could save data from a disk that may have a very limited amount of life left - sometimes falling disks will stop reading as physical damage gets worse. It will be expensive, but it's the best option they should have clean rooms for disassembling & checking it is operational. They may also know what different noises may mean - any abnormal sounds are clues to what the disk is doing (or not doing).
Another thing to consider – the external case or USB port, cable or power supply could be failing. Removing the disk & installing into another case may be a possible way to see the disks state. The age of the disk will dictate the type of case you need (SATA or ATA). Also see if another Mac mounts it - the OS could be failing not the disk.
These are the risks that your own attempts to recover or repair.
Causing more damage to the HD until it becomes totally unreadable, running several recovery or repair tools may simply cause more damage.
A physical failure can simply become fatal to the ability to read any data.
Repair tools can cause files to be lost or can recover many duplicates of data without the file names or folder structure - it can make sorting them impossible or very time consuming.
Risk damaging or altering all other connected disks … tools like photorec & testdisk are not forgiving of typo's you can easily be working with the wrong disk. Remove ALL the disks that are cannot afford to be lost (it sounds extreme, but you are already in a bad situation don't make it worse). Device names are confusing, verify twice before doing anything.
You need another disk to recover data onto this needs to be larger than the 500GB drive - you will get duplicates & may need to 'image' the entire drive before attempting repairs on the image (to limit more damage to a mechanical issue). Several disks may actually be required. ddrescue is a free tool to image failing disks.
Time is another important factor, recovery or repair can be very a slow process & should also not be rushed, spend time reading manuals & guides before using tools that are new to you. Also read other sites that discuss the tools.
It's unclear what the actual issue here is & what options you would like to take. You could just try every utility you can find, but that will cause the disk to die if it is having mechanical issues. You need to be methodical & log what info you have.
Are you really on a G4 Power Mac with 10.4.11? You will need older versions of tools like Disk Warrior to handle the disk format correctly, otherwise they may fail or cause other damage.

Seagate Barracuda 7200.10 vs 7200.11

I am going to add an additional hard drive to my G5 quad and was thinking of a Seagate in the 500GB size. This drive will act mainly as a scratch and media drive (my photos are getting out of hand)
I read somewhere that the 11th generation of the Barracuda drives is not compatible with G5 systems, that I have to go down to the 10th generation (something to do with Spread Spectrum Clocking) which also means 16mb buffer instead of 32mb
Has anyone had any luck with either of these drives?
Wojtek from Canada

Have you checked here?
http://forums.xlr8yourmac.com/drivedb/search.drivedb.lasso
OWC always checks Seagate and sometimes other models for latest firmware, so I would check there.
http://eshop.macsales.com/shop/hard-drives/3.5-SerialATA/
As for size etc. I prefer WD and would look at their 640GB model.
http://eshop.macsales.com/item/Western%20Digital/WD6400AAKS/
http://www.barefeats.com/harper14.html

Seagate Barracuda 7200.9 400GB HD - Any good? Opinions?

Hi.
I've got Mac Pro dual 2ghz w/ 2gigs of RAM - 250gb main HD for programs.
I just picked up a 2nd hard drive that I'm going to use for audio production - basically keep all my sounds/files on it - Using Logic Express 7.2 and Soundtrack pro.
I got a Seagate 7200.9 400gb hard drive (16mb cache) from Fry's, but I've seen a lot of negative reviews on Seagate drives here. I haven't formatted it yet, so I wanted to get some advice and opinions from everyone here.
Should I keep it? Should I exchange it? Please help!
Thanks in advance for your responses!
Mac Pro 2ghz Mac OS X (10.4.8) Presonus Firebox Audio Interface

Hey Dean,
when last i went to fry's here in AZ, they only had Maxtors and Seagates just a few days ago... i went there looking for a Raptor and they ran out of 150's and told me they weren't getting any more WD drives... so i left, went to ComUSA and did the deed there. they had WD drives there, but they're much less expensive at newegg.com
you know, i can't really answer you about the drive you bought because i don't know the model number. however, i can tell you i had 2 500GB Seagate ST3500641AS drives installed from Apple and they both took over 9+ hours to zero out, most likely due to either firmware or heat, or both... my 150GB Raptor zeroed out in 24 minutes and my WD RE2 zeroed out in about 2 hours.
so based on what i know and don't know about your new drive, i'd just do a basic real-world test and try zeroing out the drive. if it takes under 3 hours, it would seem you've got yourself a keeper. any longer than that? well, read these posts and you'll see what i mean...
http://discussions.apple.com/message.jspa?messageID=3766880#3766880
http://discussions.apple.com/message.jspa?messageID=3754337#3754337
good luck to you!

1.5TB Seagate Barracuda 7200.11 SATA II 7200RPM 32MB

Anyone know any reason not to use this drive for video & FCP?

PK...we recently had some problems with Seagate drives. The issue ended up being a faulty drive, but the troubleshooting involved running the Seagate Firmware Update, which you can find here...
http://seagate.custkb.com/seagate/crm/selfservice/search.jsp?DocId=207951
Following are the instructions that Rick at MacGurus so graciously provided...
The download fro Seagate mounts a disk image of a drive check utility (drive detect) that is useless except on a Windows machine. However, also in the download and in your downloads folder will be a couple other files that are the actual firmware updaters. The one with an ISO is the one you use in a MacPro. You insert a clean CD into your MacPro, select burn Disk Image and select the ISO file as the image. Then, shutdown, remove all other drives from inside the MacPro, install any Seagate drives that are appropriate for the firmware updater into the MacPro. Startup to the CD by holding the 'C' key. The CD is a bootable DOS disk with the updater on it. Only 4 letters for commands in the DOS environment: scan, update, exit and instructions. Simple and easy. When firmware update is complete you return system to normal and you are done. The update can be done in the Burly. However, only one drive per PM board is visible when booted to the DOS Bios updater. The one port is the 'pass through port' for bios since the rest of the PM board driver is not present in that simple of an operating environment. I have found it easier to just move the drives to the MacPro than to fool around with them in the Burly figuring out which bays are connected to the pass through port.. Either way, as long as the firmware updater is run the drives will be safer.<</div>
I followed these instructions and found that Rick's suggestion to boot up with the 'C' key worked, while the Seagate instructions (which said to boot up holding the 'option' key, IIRC) did not.
Also make sure you remove your boot drive, so you don't inadvertently apply the firmware update to it...unless, of course your boot drive is one of the problematic Seagate drives.
Hope that helps,
Kevan

80 GB unformatted. straight out of the factory Seagate Barracuda 7200 rpm

I own a BRAND NEW seagate HD and i was wondering if i could Mac Format it and put it in my Mac:
iMac
333 MHz
6 GB HD
92 MB RAM
Mac OS X 10.1.x
Tray Loading
24x CD-ROM
No Firewire
Classic Environment Does not work
Any Comments would be helpful!

Hey, almost the same topic question as another poster...
Yes, that should work fine. If you have an external drive case with USB, it would be useful. Even if the USB is slow on the G3 iMac, it will allow you do to the "cloning" process to replicate your current drive. If you are planning to get one for this purpose, you may want to pay a little more to get an external case with both Firewire and USB 2.0. That way, you can use it on other Macs with Firewire (or on a PC with USB 2.0)
Important Note: Your model iMac has a limitation in the IDE controller (or its driver) that requires the startup volume to fit within the first 8GB of disk space. This issue is explained here, with the solution.
http://docs.info.apple.com/article.html?artnum=25249
Based on my experience, you need to make that first partition 7.8 GB or smaller. The second partition can be any size, and you can further partition the remaining space. Note that the 8GB limit exists only during the startup process. Once control is handed off to the OS, there is no limit and the IDE controller will recognize up to 128 GB. Choose HFS+ as the format type when you partition.
Classic Environment Does not work
Hopefully you can get that resolved after the hard drive upgrade. Using a new fast hard drive with a big cache, you will notice a substantial performance increase. For $30-40, you can give it a 256MB memory boost
http://eshop.macsales.com/MyOWC/Upgrades.cfm?model=61&type=Memory&TI=3554&shoupg rds=Show+Upgrades
Classic probably does not work because of lack of RAM.

Replacing internal HDD for my 2007 24" iMac- old one is Seagate Barracuda 7200 10, 750GB (ST3750640AS). Can I replace it with a Seagate 7200 12, 1TB (ST31000524AS)?

Original HDD failed. Want to keep the computer but would like to up the HDD from 750GB to 1TB, using same manufacturer. It appears that the 1TB model is the same size and is Serial SATA like the original, but would like to confirm before purchasing.
Thanks!

Should work fine, good luck with the upgrade!
Here is a guide if you haven't stumbled across it yet=https://www.ifixit.com/Guide/iMac+Intel+24-Inch+EMC+2134+and+2211+Hard+Drive+Rep lacement/8968

Seagate Barracuda 7200 160gb Won't Mount

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