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<blockquote data-quote="bernard smith" data-source="post: 1865651" data-attributes="member: 401391">Hi,I have a 2017 iMac 5k Retina 27” to upgrade to Catalina from Mojave.It has a 1Tb SSD ( Macintosh HD ) internal drive so I don't think that there will be any problem there as it is already running as APFSHowever I have external hard drives for my photographic files used in Lightroom and Photoshop.These are NOT SSD's but spinning drives.. and this is where I am concerned most.The first is a &quot;G technology&quot;&nbsp;&nbsp; (4 TB)&nbsp;&nbsp; ....&nbsp; SATA&nbsp;&nbsp; this is where all my photographic files are kept.I also have 2 Samsung D3 (6 TB) (spinning) drives which are copied from the above drive using Carbon Copy Cloner to give redundancy in my set up.&nbsp; This means that I have 3 copies of the files&nbsp; ( 1 on the first G Technology 4 TB and 2 more on the Samsung D3 6 TB drives )... My question is this:Will my EHD's ( G Drive and Samsung...&nbsp; spinners ) be recognised so that I can access the files after upgrading from Mojave to Catalina? They are set up as Mac OS Extended (Journaled) with GUID partition map.I also have a &quot;G technology&quot; (1 TB) SSD that is used exclusively for Time Machine.&nbsp; Will this be OK after the upgrade to Catalina?I really am scared of losing the ability to use my external drives.If there are any articles regarding this then I would appreciate a link to them.CheersBernard</blockquote>

[QUOTE="bernard smith, post: 1865651, member: 401391"] Hi, I have a 2017 iMac 5k Retina 27” to upgrade to Catalina from Mojave. It has a 1Tb SSD ( Macintosh HD ) internal drive so I don't think that there will be any problem there as it is already running as APFS However I have external hard drives for my photographic files used in Lightroom and Photoshop. These are NOT SSD's but [B][U]spinning[/U][/B] drives.. and this is where I am concerned most. The first is a "G technology" (4 TB) .... SATA this is where all my photographic files are kept. I also have 2 Samsung D3 (6 TB) (spinning) drives which are copied from the above drive using Carbon Copy Cloner to give redundancy in my set up. This means that I have 3 copies of the files ( 1 on the first G Technology 4 TB and 2 more on the Samsung D3 6 TB drives )... My question is this: Will my EHD's ( G Drive and Samsung... spinners ) be recognised so that I can access the files after upgrading from Mojave to Catalina? They are set up as Mac OS Extended (Journaled) with GUID partition map. I also have a "G technology" (1 TB) SSD that is used exclusively for Time Machine. Will this be OK after the upgrade to Catalina? I really am scared of losing the ability to use my external drives. If there are any articles regarding this then I would appreciate a link to them. Cheers Bernard [/QUOTE]

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