EOS Photography wrote:
I use both Mac and PC. This Seagate disk is designed to operate with both. It has been working with both Mac and PC at least for last three years.

Have you tried to use it on both computers?

EOS Photography wrote:
I use both Mac and PC. This Seagate disk is designed to operate with both. It has been working with both Mac and PC at least for last three years.

Shadow Dancer wrote:
Have you tried to use it on both computers?

currently most external seagate disks come preformatted with fat32 which works on both mac and pc. most likely if the computer does not recognize the file system the partition table or the file allocation table has been trashed. you can try the techs at some stores like staples, office depot or best buy - but their techs are iffy and mostly driven by money. they can charge you and make the problem worse at the same time.

the other solutions at the recovery companies are also expensive (seagate and ontrack) $600 and up to look at the problem and tell you if it's possible - then the cost to recover goes up from there. a partition table repair utility may work - it's likely the least expensive.

just use the back-ups. if you have no back-ups, well, there is a lesson in there somewhere.

Leonard Gee Photography wrote:

EOS Photography wrote:
I use both Mac and PC. This Seagate disk is designed to operate with both. It has been working with both Mac and PC at least for last three years.

currently most external seagate disks come preformatted with fat32 which works on both mac and pc. most likely if the computer does not recognize the file system the partition table or the file allocation table has been trashed. you can try the techs at some stores like staples, office depot or best buy - but their techs are iffy and mostly driven by money. they can charge you and make the problem worse at the same time.

the other solutions at the recovery companies are also expensive (seagate and ontrack) $600 and up to look at the problem and tell you if it's possible - then the cost to recover goes up from there. a partition table repair utility may work - it's likely the least expensive.

just use the back-ups. if you have no back-ups, well, there is a lesson in there somewhere.

Yes, but our OP has not been forthcoming with an abundance of information so I ask.
I've formatted disks on my Mac so I can install an older system and boot from that drive to use legacy software.
I don't have a PC at home so I don't know if Windows can see it or not.

Unless we know everything our OP is doiing, has done, etc., there are still unexplored possibilities.

I agree about Best Buy, I would avoid. There may be somebody on craigslist who could be vetted and knows what they are doing. Still a risk of total loss of data.

For that matter, the drive itself may be failing, sometimes they fail a bit and then die.

Leonard Gee Photography wrote:
just use the back-ups. if you have no back-ups, well, there is a lesson in there somewhere.

Sadly, the most valuable lessons are the ones that are the most painful. It's why every photo I shoot goes on a Raid 1 set of drives and is backed-up online. Unfortunately, I do this because I once too had to learn this lesson the hard way.