The Ultimate Guide to Apple's Proprietary SSDs

Why Apple Uses Custom Connectors

When the rest of the PC industry settled on the M.2 connector as the standard for solid-state drives, Apple went a different direction. Starting in 2010, every Mac laptop and many desktops shipped with a proprietary SSD connector that only fits Apple hardware. The pin layouts — 6+12, 7+17, 12+16, and finally 22+34 — changed with almost every generation, and none of them are compatible with off-the-shelf M.2 drives.

For Apple, proprietary connectors mean tighter integration, thinner logic boards, and more control over the supply chain. For you, it means you can't just buy any NVMe drive and drop it in. Upgrades require generation-matched modules or third-party adapters, data recovery needs specialised tooling, and a dead SSD on a 2016+ MacBook may mean the entire logic board needs attention because the storage is soldered on.

This guide covers every generation of Apple's proprietary SSDs — what connector they use, how fast they are, which Macs have them, and what your real options are when you need more storage or your data back.

What Kind of SSD Is in the MacBook Pro Retina?

The MacBook Pro Retina line spans four distinct generations of Apple's proprietary SSD — each with a different connector, interface, and speed. The short answer depends on exactly which Retina model you have: the year and the display size both matter.

Apple Model Identifiers for Each Retina Generation

Apple assigns internal model identifiers that precisely specify hardware generation. If you need to confirm exactly which SSD connector your MacBook Pro has, the model identifier is the definitive source — more reliable than the marketing name, which Apple reused across different hardware configurations. Find yours via Apple menu → About This Mac → System Report → Hardware Overview → Model Identifier.

The Key Differences Between Retina Generations

All MacBook Pro Retina models from 2012 through 2015 use removable proprietary SSD modules — none of them are soldered. This means storage upgrades are possible, and data recovery without a working logic board is achievable by removing the drive and reading it with the appropriate adapter hardware.

The 2012 and early 2013 Retinas use a SATA-based connector (Gen 2, 7+17 pin) and max out at 600 MB/s — fast for the era, but well below what even a mid-range NVMe drive delivers today. The Late 2013–2015 models switched to PCIe via the 12+16 pin connector (Gen 3 and 4), delivering 800–1,600 MB/s depending on model — still competitive with modern SATA SSDs.

From 2016 onwards, MacBook Pros moved away from Retina branding and changed connector again (22+34 pin Gen 5). The 2016 and 2017 models have a removable Gen 5 SSD with very limited third-party upgrade options. From 2018, storage is soldered to the logic board — no upgrade possible.

Connector Generations at a Glance

Apple's SSD connector evolved five times in six years. Each generation changed the physical pin layout, making drives from one generation incompatible with another.

Speed Comparison

Each generation brought a significant jump in raw throughput. The move from SATA to PCIe was the biggest single leap, and NVMe on Gen 5 doubled it again.

Generation Details

Can I Upgrade My Mac's SSD?

Whether you can upgrade depends entirely on your Mac's model year and which generation SSD it uses.

1. 2010-2011 Macs (Gen 1) — Upgradeable. You can replace the original mSATA drive with a higher-capacity Gen 1 module. Third-party options from OWC and Transcend are available. Expect SATA II speeds regardless of the replacement drive.
2. 2012-2013 Macs (Gen 2) — Upgradeable. Easiest generation to upgrade. Plenty of third-party 7+17 pin drives on the market. You can also use an M.2 SATA drive with a compatible adapter, though quality varies.
3. 2013-2015 Macs (Gen 3/4) — Upgradeable with caveats. The 12+16 pin connector accepts both Gen 3 and Gen 4 drives, but your Mac's firmware determines the actual speed. A Gen 4 drive in a Gen 3 Mac will work but run at Gen 3 speeds. M.2 NVMe adapters exist but can be finicky — we recommend OWC Aura Pro X2 or Sintech adapters with confirmed-compatible NVMe drives.
4. 2016-2017 MacBook Pro (Gen 5, removable) — Limited upgrade options. The 22+34 pin connector is unique to this generation. Only a few third-party modules exist. Apple offered an SSD repair kit for data transfer, but it's not widely available.
5. 2018+ Macs (Gen 5, soldered) — Not upgradeable. Storage is permanently attached to the logic board. The only option is to use external storage via Thunderbolt 3/4 or USB-C. Choose your configuration at purchase.

If you're unsure which generation your Mac has, bring it in and we'll identify it for free. We keep Gen 2, 3, and 4 upgrade modules in stock for same-day upgrades on most compatible models — see our MacBook repair pricing for indicative costs.

What to Look For in an SSD Upgrade Kit

If you've identified that your Mac is upgradeable from the list above, the next question is which kit to buy. Mac SSD upgrades have a few specific gotchas that don't apply to standard PC SSD upgrades — here's what we check before recommending a kit to a customer.

• Confirmed compatibility with your specific model year. "Works with MacBook Pro Retina" isn't precise enough — generation matters. A Gen 4 drive in a Gen 3 Mac will physically fit but boot inconsistently, and Gen 5 modules won't fit at all. Check the kit's compatibility list against your exact Mac model identifier (Apple menu → About This Mac → System Report).
• NAND quality and endurance rating (TBW). Cheap kits cut costs by using QLC or unbranded NAND with low write endurance. For a daily-driver Mac, look for TLC NAND with a TBW (Terabytes Written) rating of at least 600 TBW per terabyte of capacity. A 1 TB drive rated 200 TBW will degrade within two to three years of normal use.
• Sustained sequential write speed, not just peak read. Manufacturers love advertising 3,500 MB/s peak read. The number that matters is sustained write under load — what the drive can actually maintain when you're copying a large file or doing a Time Machine backup. For Gen 4-compatible drives, look for sustained write benchmarks above 1,500 MB/s.
• The right tools, included or sourced separately. You'll need a Pentalobe P5 driver for the bottom case and (on most generations) a T5 Torx for the SSD module screw itself. Don't try to remove the bottom case with a Phillips — you'll strip the screws. Either buy a kit that includes the right drivers, or pick up a precision driver set separately.
• For NVMe-via-adapter installs on some Gen 3/4 Macs: the adapter brand matters more than the NVMe drive brand. Sintech and OWC have established Mac firmware compatibility tables. No-name adapters may install fine and then refuse to boot after a macOS update. Stick to brands with a Mac-specific compatibility track record.
• Plan the data migration before you start. macOS Recovery + Time Machine works for most upgrades, but if you're moving to a noticeably larger drive you'll want to clone first (SuperDuper or Carbon Copy Cloner — both have free trial modes sufficient for a one-time clone). Never wipe the original drive until you've successfully booted from the new one.

Data Recovery from Apple SSDs

Apple's proprietary connectors create unique challenges when something goes wrong and you need your data back.

Why it's harder than standard drives: With a standard M.2 drive, any data recovery lab can plug it into a universal reader. Apple's custom connectors mean you need generation-specific adapter hardware just to read the drive outside the Mac. Worse, Apple's T2 security chip (2018+) and Apple Silicon (M1/M2/M3/M4) encrypt the SSD at the hardware level — even if you can physically access the storage chips, the data is encrypted and tied to that specific machine's Secure Enclave.

Recovery by scenario

• Dead logic board, working SSD (pre-2018): We remove the proprietary SSD module and read it using generation-matched adapter hardware. High success rate — the data is usually intact.
• Dead logic board, working SSD (2018+ with T2/Apple Silicon): The SSD is soldered and encrypted. If the board powers on enough to enter DFU mode, we may be able to transfer data to another Mac using Apple Configurator. If the board is completely dead, recovery requires board-level repair first to get the machine booting — there's no shortcut past the encryption.
• Corrupted or failing SSD (any generation): Software-level corruption can often be recovered with disk imaging tools. For drives with failing NAND cells, we clone at the lowest level possible before attempting file recovery. Time-sensitive — the longer a failing drive runs, the more data is lost.
• Liquid damage affecting the SSD slot: Corrosion on the connector pins can cause read errors or prevent the Mac from seeing the drive at all. We clean and repair connector damage at the board level, then image the drive immediately.

The single most important thing you can do is stop using the Mac immediately if you suspect drive failure. Continued use on a failing SSD overwrites recoverable data and accelerates NAND degradation. Our data recovery service handles all generations of Apple's proprietary SSDs — bring it in and we'll assess the situation before any further damage occurs.