Did Apple disable adaptors that accommodate external drives with USB B

MarioFrez wrote:

Dear RKaufmann

Do the iMac and MacBook Pro apple prescribe specs for adapters.

My adapters worked well with both iMac and MacBook Pro for years....only to find out that they stopped working last Tuesday.

What happened "last Tuesday?" Did you update something, or did your computer perform an automatic update?

Look in About This Mac ... click System Report ... then under Software select Installations. Look for something that was installed or updated on the date that corresponds to the date when your problems started.

Two possibilities (this is not an exhaustive list):

• Your Macs were updated and you have been using older non-Apple adaptors or hubs that are not compatible with the updated MacOS. What adaptors and hubs have you been using? Make, model, etc.
• The problems may be with the external drives, not with the adaptors. What type of drives, what make, what model, how old? How are they formatted? Have you installed any software or firmware that came with the drives? This could include drive manufacturer utilities, tools, firmware that enables "push button" functions or special displays on the drives, etc.

No they are not, your adapters failed, just try some new ones.

Not that I am aware of, neither do Dell, HP, Asus or any other computer mfg. that I'm aware of. Instead of buying adapters have you considered upgrading your peripherals to have more up-to-date connections. If you are using External Hard Disks that are 4-5 years (or older) they should be upgraded anyway, why, simple all HD's die and it's smarter to be proactive.

This does not address your issue directly but I would recommend that you format all drives to APFS GUID partition to use with the new Mac and latest OS.