Apple price $999 plus tax. Not a preferred option. Price of SSD and Cable $83 (Amazon Prime) delivered in about 3 days.
Let's take the entry-level 15-inch MacBook Pro, which comes with 256 GB SSD. Before today, a 512 GB upgrade cost $200, the 1 TB SSD cost $600, the 2 TB SSD cost $1,200, and the high-end 4 TB capacity was $3,000. Now, these same upgrades come in at $200, $400, $800, and $1,600.
For maximum performance you should have at least 10% free or better up to 20%.
MacBook Pro SSD upgrade costs $330-$700, MacBook Air SSD upgrade costs $350-$550 depending on the SSD drive capacity and MacBook model. Our MacBook SSD upgrade service includes SSD drive installation and data transfer.
512GB of space is decent if you don't plan to install big apps or keep huge photo and video libraries around. If you do, get at least 1TB. Otherwise, you'll have to add more MacBook space by relying on external drives, the cloud, and network storage.
With a 256GB SSD 220 Gigabytes will be available to the end user.
Because the Mac Studio has physically removable SSDs, removing and replacing them should work as it does in a PC. Apple implemented some kind of "software block" to prevent the Mac Studio from booting after its storage has been replaced, as evidenced by the power LED's blinking amber "SOS" pattern.
Apple's new Mac Studio was revealed to have an interesting secret over the weekend: it has removable SSD storage.
How to upgrade your MacBook Air with an SSD
Install an SSD in your MacBook Pro
Remove the hard drive from your MacBook Air
You need a lot of storage First, Apple's PCIe SSDs will be significantly faster than an external HDD. That may not be a problem if you use the HDD to store files you rarely access, but if you frequently use it, you may feel the slowdown.
Sticking with my thoughts about not buying the least expensive model, I would suggest going with at least 512GB (or 1TB) for the 13-inch model and 1TB for the 16-inch model. If money is less of a factor, consider bumping that up to 2TB on either version.
Apple has determined that a limited number of 128GB and 256GB solid-state drives (SSD) used in 13-inch MacBook Pro13-inch MacBook ProApple 60W MagSafe 2 Power Adapter (MacBook Pro with 13-inch Retina display) (non Touch Bar) units have an issue that may result in data loss and failure of the drive. 13-inch MacBook Pro units with affected drives were sold between June 2017 and June 2018.