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If you have a new iPhone or Mac, there are plenty of reasons to go update to iOS 18.4 or macOS 15.4, but users of older devices might not be so quick to hit the download button. But these updates are especially important—Apple has patched a pair of vulnerabilities originally fixed in iOS 18.3.1 and 18.3.2 and five dozen fixes for newer phones and Macs.

In iOS 16.7.11 (compatible with iPhones 6-13) and iOS 15.8.4 (compatible with iPhones 8-14), Apple issued a pair of security updates to fix zero-days previously exploited in the wild. Apple previously addressed the flaws in iOS 18.3.1 (Accessibility) and 18.3.2 (WebKit) for newer iPhones, but they remained exploitable in older phones until this week.

Apple also patched an actively exploited CoreMedia flaw in older iPads and Macs that was first fixed in iOS 18.3 and macOS 15.3.

Apple says the vulnerabilities were used in “extremely sophisticated” attacks, meaning hackers targeted high-level individuals in government or business. However, as long as the flaw remains open on your devices, there is still a risk that it could be exploited with lower-level malware, so we recommend updating as soon as possible. See our tests of the best Mac antivirus programs for more security options.

Apple also issued a few dozen security fixes for newer iPhones and Macs with iOS 18.4 and macOS 15.4, as well as updates to iPad, Apple Watch, Apple TV, and Vision Pro so no matter what Apple device you own, go update this weekend before it’s too late. 

Apple offers pretty good prices on the standard configurations of its Macs. $599 for a M4 Mac mini? $999 for a new M4 MacBook Air? $1,299 for a new M4 iMac? Those are attractively priced. But those prices involve a few sacrifices, most notably the starting storage of just 256GB. A quarter of a terabyte might sound like a lot, but much of what we do on the Mac involves large files–high-resolution pictures, videos, games (literally the biggest culprit), and a lot more. 256GB runs out quickly.

Apple does give customers the option to upgrade storage at the point of purchase, of course, but their prices are steep. Upgrading from 256GB to 512GB (the minimum amount we recommend) is an extra $200/£200, and jumping to a terabyte is another $200, turning an attractive entry-level offering into a pricey one.

But if you don’t want to plunk down the extra money, you can still expand your Mac’s storage without paying Apple’s exorbitant prices. The alternatives here are mostly external storage solutions–in other words, you’ll need to carry and plug in an extra device–but the compromise can help you meet your budget.

External SSDs and hard drives

An external storage device offers the best combination of price and capacity. For example, you can get a 1TB LaCie Mobile Drive for about $80/£56 on Amazon that connects to your Mac via USB-C. LaCie sells that same drive with 5TB of storage for less than $170/£115–still lower than the upgrade to 512GB of internal storage on a Mac.

With external drives, you can opt for a hard drive or a solid-state drive (SSD). SSDs (which are used internally on the Mac) are faster and higher-priced than hard drives. You can also choose between desktop drives that have a larger design and require you to plug it into a power outlet, or portable drives that are small enough to fit in a bag or pocket and are powered through the Mac’s Thunderbolt or USB port.

External drives use either USB-C or Thunderbolt to connect to the Mac. Thunderbolt drives are more expensive but faster, while cheaper USB-C-only drives often support slower data transfer rates. Learn more about the differences between Thunderbolt and USB.

Macworld has guides to the best external SSDs and the best external hard drives to help you find the best device for you.

USB flash drives

Often called “thumb drives” or “memory sticks,” a USB flash drive is essentially a stick of flash memory that plugs into a USB port. They’re small and easy to stash in a bag or pocket. They are available in capacities as high as 2TB, but 128GB and 256GB capacities are most commonly found, often for less than $30, such as this Samsung flash drive.

USB flash drives vary in price based on capacity and speed. Some have additional features such as a USB-A plug on one end and a USB-C plug on the other, or built-in encryption.

You can leave a USB flash drive plugged in, but if you are going to frequently read and write to the drive, you’ll want to opt for a portable or desktop drive instead. USB flash drives are more prone to wearing out than a full-fledged drive because flash memory has limited durability and USB flash drives don’t have the measures in place to maintain proper health. Also, they tend to use lower-quality parts so they can be cheap and treated as commodities (for example, the corner near my home sells USB flash drives).

While you don’t want to rely on USB flash drives are primary storage, they’re handy for, say, storing photos or videos from a shoot, file management when you want to keep files for a project separate from everything else, backups, and more.

SD cards

SDXC cards are memory cards often used in cameras and other portable devices, but you can also use them on the Mac. Only two Macs (MacBook Pro and Mac Studio) have built-in SDXC Card slots, however. For every other Mac, you must buy an SD Card adapter, which is inexpensive at about $10/£10. You can also find hubs and Thunderbolt docks with card slots if you plan to buy one anyway.

SDXC cards are good for uses similar to USB flash drives: file transfers, specifically storing files for projects, backups, and more. They have similar issues regarding the memory chips wearing out; they are more reliable because they use higher-quality memory, but they aren’t ideal as a drive that is always connected, and you are frequently reading and writing files to.

If you plan to use an SDXC card as a method of transferring files between Macs or other devices, consider buying another card as a backup. I’ve had instances where the metal contacts for the card get worn out or damaged from frequent insertions into devices. These cards did have several years of mileage on them but understand that they’re delicate relative to other storage devices mentioned here.

Cards are available in capacities between 32GB and 2TB and are available at different speeds. The higher capacity/faster cards can be more expensive than an external SSD drive of the same capacity, as you’re paying a premium for the extremely small size.

Network-attached storage

If you’re not familiar with network-attached storage (NAS), think of it as cloud storage, but specifically for your home. A NAS device connects to your home network, and your Macs, iPhones, iPads, and even Windows PCs and Android devices can access it whenever necessary. A NAS device is a good way to store files that need to be accessed by several devices or users, or it can be a way for individual users to move files from a device to free up space.

Because the NAS device connects to a network, the setup isn’t as simple as plug-and-play, but it’s not too difficult. Once it’s up and running, you can access it either through the Network menu in the Finder, or through an app, browser, or both. Some NAS devices can provide access when you’re away from home, but this may require using a paid service from the device’s company.

NAS devices range from ones with fixed hard drives starting at 2TB for $150/£150 to drives with multiple removable hard drives with capacities over 8TB and other features for several hundreds of dollars. Check out our picks for the best NAS drive for Mac if you’re interested.

Cloud storage

Cloud storage is provided by a service online for a fee, usually a subscription. Apple offers iCloud, which includes iCloud Drive along with other services. Other popular cloud storage providers include Dropbox, Google Drive, Microsoft OneDrive, and Box. Learn more about the best cloud storage services for the Mac.

What’s great about cloud storage is that it is accessible by almost any device that has an internet connection. But because your ability to access it is reliant on the internet, cloud storage shouldn’t be used as primary storage. It’s good for storing files you want to access but not ones you use frequently, things like backups, photo and video storage, and file transfers. But it’s a great way to free up space on your Mac’s drive.

Also, since you have to pay a recurring fee, you’ll need to figure out how the cost benefits you. Many services have a free tier with a small allocation of storage; for example, iCloud Drive offers 5GB free. That limits what you can do.

Mac mini and Mac Studio SSD upgrades

The M4 Mac mini and the Mac Studio have internal SSDs that are installed in slots, which makes them upgradeable but Apple doesn’t officially support upgrades after purchase by the company, a third party, or by do-it-yourselfers. Some small companies have released SSD upgrade kits, such as Expand Mac mini and PolySoft Services with video instructions on their websites.

The installations for these kits aren’t trivial but if your mechanical aptitude is limited, you should be able to do this. There is a risk of damaging your Mac and this installation could void your warranty, especially if there is obvious evidence of your work.

If you have an M2 Mac mini there are other ways to upgrade its memory. Learn more.

If you’ve got a to-do list this weekend, we’ve got one more item for it: update your iPhone, iPad, and Mac. An update was released this week that patches a vulnerability first spotted way back in December 2023.

According to Apple’s release notes, the fix affects iOS 18, iPadOS 18, macOS 15, and visionOS 2, as well as Safari 18 for macOS Ventura and macOS Sonoma users. The release notes say the updates include unknown bug fixes, but the big reason to update is a single security update across all devices:

• Impact: Maliciously crafted web content may be able to break out of Web Content sandbox. This is a supplementary fix for an attack that was blocked in iOS 17.2. (Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 17.2.)
• Description: An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions.
• WebKit Bugzilla: 285858
• CVE-2025-24201: Apple

Apple is credited with discovering the flaw, which was initially patched on December 11, 2023, with iOS 17.2 and macOS Sonoma 14.2. It’s unclear which WebKit patch fixed the original vulnerability.

So far this year, Apple has fixed three zero-days, which are defined as flaws that were previously unknown. While Apple’s language implies this threat was used in targeted attacks, you should definitely update your devices if you haven’t already.