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Introduction

Follow the steps in this guide to upgrade or replace the SATA hard drive in a 21.5" Retina 4K 2019 iMac. Note that if you are upgrading your drive, you will need to clone your existing hard drive onto the replacement prior to performing this upgrade to keep your files and operating system.

Some images in this guide use an older iMac, which has minor visual differences. These differences do not affect the repair procedure.

    • With the hinge free to move, the iMac will be unbalanced and hard to work on. Place an iMac service wedge, in the stand to stabilize the iMac.

    • If you are using the iFixit cardboard service wedge, follow these assembly directions to put it together.

    • Before beginning any work on your iMac: Unplug the computer and press and hold the power button for ten seconds to discharge the power supply's capacitors.

    • Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

    Maybe your directions should suggest fixers to buy RAM cards in pairs. I wanted 32 Gig of RAM, and I bought and installed one 32 G RAM and while it seems fine, one source told me it would be 5-10% faster if I had put in two 16 RAM cards. Is that accurate?

    BRUCE CLARKE - Reply

    it would at least be that much faster, in theory some applications should run twice as fast

    blakebest -

  1. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Insert the opening tool: step 2, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Insert the opening tool: step 2, image 2 of 2
    • Starting on the left side of the display, near the power button, insert the iMac Opening Tool into the gap between the glass panel and the rear enclosure.

    • The hub on the iMac Opening Tool will keep you from pushing the wheel in too far. If using a different tool, insert no more than 3/8" into the display. Otherwise, you risk severing antenna cables and causing serious damage.

  2. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Slice through the display adhesive: step 3, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Slice through the display adhesive: step 3, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Slice through the display adhesive: step 3, image 3 of 3
    • Use the tool like a pizza cutter—roll it along the gap, cutting the foam adhesive in between the frame and display.

    • Be sure to always push with the cutting wheel forward. If you pull, the wheel might get pulled out of the handle.

    • Run the tool up along the left side of the display.

  3. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 4, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 4, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 4, image 3 of 3
    • Continue running the tool up around the top left corner.

  4. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 5, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 5, image 2 of 2
    • Cut the adhesive along the top left of the display.

  5. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 6, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 6, image 2 of 2
    • Continue along the top of the display.

    • You may want to run the tool back and forth a few times to ensure you completely cut through the adhesive.

  6. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 7, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 7, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 7, image 3 of 3
    • Push the tool around the top right corner of the display.

  7. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 8, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 8, image 2 of 2
    • Push the tool down along the right side of the display.

  8. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 9, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 9, image 2 of 2
    • Finish pushing the opening tool to the bottom of the right side of the display.

    • At this point, you'll want to run the tool back around the entire display, to ensure you cut as much adhesive as possible.

  9. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 10, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 10, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 10, image 3 of 3
    • While the opening tool cut most of the adhesive, the display will still be slightly adhered to the case. A plastic card will be necessary to free up the last of this adhesive.

    • Set the iMac face-up on a table.

    • Starting from the top right corner of the iMac, wedge a plastic card between the display and frame.

    • Be careful not to insert the plastic card more than 3/8", or you may damage internal components.

    9.5mm in the rest of the world

    Tal Glazer - Reply

  10. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 11, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 11, image 2 of 2
    • Gently twist the plastic card sideways to create a gap between the display and frame.

    • Move slowly and be careful not to stress the display glass too much—you only need to make a gap of about 1/4".

    Which is around 6.5mm

    Tal Glazer - Reply

  11. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 12, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 12, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 12, image 3 of 3
    • Slide the card toward the center of the display to cut any of the remaining adhesive along the top right corner of the iMac.

    • Be sure to stop before the iSight camera, or you may damage it.

  12. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 13, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 13, image 2 of 2
    • Wedge the plastic card into the top right corner once again, and leave it there to prevent the adhesive from resticking.

  13. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 14, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 14, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 14, image 3 of 3
    • Insert a second plastic card into the gap between the display and frame near the top left corner of the iMac.

  14. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 15, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 15, image 2 of 2
    • Gently twist the card upward, slightly increasing the space between the display and frame.

    • As with the other side, twist slowly to allow the adhesive time to separate, and be careful not to over-stress the display glass.

  15. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 16, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 16, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 16, image 3 of 3
    • Slide the plastic card toward the center.

    • Stop sliding just before the iSight camera to avoid damaging the camera.

  16. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 17, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 17, image 2 of 2
    • Wedge the plastic card back into the top left corner.

  17. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 18, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 18, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 18, image 3 of 3
    • With both plastic cards inserted as shown near the corners, gently twist the cards sideways to increase the gap between display and case.

    • If there are any sections that seem to stick and won't separate, stop twisting and use one of the cards to cut the remaining adhesive.

    • Begin to lift the top of the display up from the frame.

    • Only lift the display a few inches—the display data and power cables are still connected to the logic board.

  18. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Display Assembly Cables: step 19, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Display Assembly Cables: step 19, image 2 of 2
    • Lift the display up enough to have easy access to the connector, but not so much that you stretch the cables and stress their connections (about 8").

    • Hold the display with one hand while using your other hand to unplug the display power cable.

    It was difficult to remove this connection. I ended up having to gently pull-up vertically a little on the wire side to unsnap it about 1mm and then horizontally wiggle it out.

    delacrj2 - Reply

    I had a difficult time removing this connection. I had to lift the wire-side about 1mm before it unsnapped and then carefully wiggle it out horizontally.

    delacrj2 - Reply

    Can this cable be replaced? I am worried mine is damaged. I have no display after the screen fell and stressed the display flex cables following an SSD upgrade.

    Jeremy Brainard - Reply

    This step should be done with extreme caution and care, as this step 19 is not described in great detail (sorry, author).

    The first (most outward) cable will slide out by gently pulling it by its tabs. The second (inner) cable is more tricky, as the locking lever must be moved backward first, before gently pulling backward on the cable connector. The angled tweezers are useful here, to help lift that locking lever, because fingers are too big for this.

    Ernst - Reply

    be VERY careful and SLOW...take your time. These displays crack VERY easily when removing and they'll spider web on you. I've done probably 20 or so of these and cracked 3 being super careful.....ugh.

    Faslane - Reply

  19. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 20, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 20, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 20, image 3 of 3
    • Continuing to support the display with one hand, flip up the metal retaining bracket on the display data cable.

    • Carefully pull the display data cable from its socket on the logic board.

    • Be sure to pull the display data cable connector straight out of its socket, keeping it parallel to the motherboard, to avoid damaging it.

    Cannot seem to find a replacement cable for this, as I suspect mine is damaged. Can’t even find a part number. Anyone know what it might be?

    Jeremy Brainard - Reply

    https://www.amazon.com/gp/product/B08TTL...

    That's the part I ordered for mine and it seems to work ok. I did make a point of contacting the seller and advising them of my requirement and they ensured I got the right part and it matches the description of the link. Bear in mind I bear no responsibility if yours does not work since I am just sharing what I did and what I ordered. Thanks.

    Jim Stanford -

    I also need that cable.

    cameronjpu - Reply

    It's a little difficult to tell... but looking at the connection to the logic board on the video data cable, are the pins faced up or down?

    On the display, same question since it appears you have to "twist" the cable during the reconnection step.

    Jim Stanford - Reply

  20. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Separate the display: step 21, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Separate the display: step 21, image 2 of 2
    • Lift the display up to a near-vertical position.

    • At this point there is still a strip of adhesive along the bottom of the display that will hold the display to the frame like a hinge. You can loosen this adhesive by working the display up and down a few times.

  21. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 22, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 22, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 22, image 3 of 3
    • If necessary, a plastic card can be used to cut any remaining sections of the bottom adhesive strip.

    The bottom adhesive strips have small tags at a 90 degree angle that can be used as handles to strip them out at this point. https://d3nevzfk7ii3be.cloudfront.net/ig...

    Dom - Reply

  22. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 23, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 23, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 23, image 3 of 3
    • Lift the display up from the frame and remove it from the iMac.

    • It may be necessary to slowly lift from one side to peel against the remaining adhesive.

    • Be very careful handling the display—it's big, heavy, and made of glass.

    • After the adhesive is cut, it cannot be used to re-seal the display in place. Follow this guide to replace the adhesive strips that secure the display to the rear enclosure.

  23. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Hard Drive Brackets: step 24, image 1 of 1
    • Remove the following T10 Torx screws securing the hard drive brackets to the iMac:

    • Two 21 mm screws

    • One 9 mm screw

    • One 27 mm screw

    At step 26, when reassembling, it's super easy to over-tighten the 9mm screw and strip the brass ferrule out of its hole in the plastic bracket (%#*@).

    roberttrevellyan - Reply

    Mine has 4 different length screws, the two red colored 21mm screws in this guide are actually two differ lengths

    anonymous 523 - Reply

    Mi imac does not have a HDrive whats the steps to follow?

    Charlie - Reply

  24. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 25, image 1 of 2 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 25, image 2 of 2
    • Remove the left and right hard drive brackets from the iMac.

  25. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Hard Drive Assembly: step 26, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Hard Drive Assembly: step 26, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Hard Drive Assembly: step 26, image 3 of 3
    • Lift the hard drive from the edge nearest the logic board and pull it slightly out of its recess.

    • The hard drive is still attached by its SATA cable; do not attempt to fully remove it from the iMac yet.

  26. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 27, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 27, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement: step 27, image 3 of 3
    • Use a spudger to disconnect the single SATA cable by prying it gently away from the hard drive.

    • Remove the hard drive assembly from the iMac.

    I’ve found that loosening the T10 screws on the enclosure to the left helps give some room to remove and reinstall the drive. Otherwise reattaching the SATA cable can be a hassle.

    rothgar - Reply

  27. iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Hard Drive: step 28, image 1 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Hard Drive: step 28, image 2 of 3 iMac Intel 21.5" Retina 4K Display 2019 Hard Drive Replacement, Hard Drive: step 28, image 3 of 3
    • Peel the rubber bumper off one side of the hard drive.

    • Repeat for the other side.

    • When installing a new drive, it's helpful to use double-sided tape to stick the bumpers to your new drive.

    reconnecting the new drive can be a little tricky as the sata connector in the Mac is hard to align. I found that it helps to move the end of the bumpers out of the way, then push them back into position once the drive is connected.

    Gareth Jones - Reply

    thats what it did as well, thx for the hint. also i used a plastic spudger to reconnect the plug unto the new drive and leveled it against the speaker casing thats so close to the drive bay

    Stef999 - Reply

    Can I install a Samsung 850 EVO 500GB to replace my 1TB 5400rpm disk? and is a seperate thermal sensor/cable needed to prohibit the fan to run at 100% all the time?

    Maurits K - Reply

    Yes you can install ANY SATA SSD.

    And no … there is no thermal sensor on the drive. You don’t need them on these models.

    robert Seith -

    Can I install a Seagate FireCuda 2TB to replace my 1TB 5400rpm disk? and is a seperate thermal sensor/cable needed to prohibit the fan to run at 100% all the time?

    andrew mudd - Reply

    Did you ever find out if you could replace your 500 GB with that Firecuda? I’m looking at doing that. I need more storage for my 500 GB photos library and don’t want to pay so a ton for the SSD that is big enough.

    shippster -

    where is the guide for the follow up ?

    installing a new hard disk and closing the screen back up.

    yog1389 - Reply

    The SSD was a HUGE performance boost over the 5400rpm drive my iMac came with. If you’re pulling your hair out because Lightroom has become excruciatingly slow, upgrade your hard drive to SSD. You will not be disappointed.

    The kit has everything you need. Follow these instructions carefully and you’ll be fine.

    Mike Mullis - Reply

    Huge improvement! It’s like a new machine. Highly recommended upgrade.

    Take care with the adhesive strips, and don’t forget to set new SSD as the boot disk (System Preferences, Startup Disk) after you’ve tested its bootable.

    Stephen Babbage - Reply

    I previously had a fusion drive and installed a SSD. Will there be any issues with the ssd portion of the fusion drive? I still see it there in disc utility. Also, I’m showing two SSDs, along with the 32 gig one. Is that correct or did I create something that shouldn’t be there?

    rossmueller - Reply

    I have this same question. I’m showing 2 drives but 1 is grayed out on the computer screen when I click on it nothing happens.

    Frank -

    A fusion drive combines two physical disks via software to act as one. It it something that has to be done manually and expressly. When you first got the computer, your fusion drive combined disks A (SSD) and B (HDD). If you replaced B, then you probably have an unused 32 GB blade SSD along with your new SSD. It possible to create another Fusion drive, but you’d have to start from zero, because creating a fusion drive erases the individual disks completely.

    also, not 100%, but I tried for several hours the other day and I’ve come to the conclusion that my version of Big Sur (11.1) doesn’t support Fusion Drives. Correct me if I’m wrong. Or maybe it’s because I’m running Big Sur on an unsupported iMac.

    David -

    It is also possible install the bumpers after getting the drive cable attached. This gives you more room to work with the cable and drive.

    Sean Kane - Reply

    The hardest part was to plug the connector into the new SSD. I loose the two screws of the adjacent (left) speaker and move it just enough to have sufficient space to introduce my fingers to push the conector into the SSD. Left the replace of the rubber bumpers after reconnect the SSD, is easy to handle without it.

    Dennis Salas - Reply

    I bought Samsung QVO 1TB SSD and now the fan is blasting fast and loud. So if these don’t use the thermal cables then what seems to be triggering the high temp? Obviously it’s the hard drive but could it be that the drive was cloned? I’m kinda stumped, I know I can control with software but some of you are saying it should run normal after install. Thanks for the info.

    MonoFrio - Reply

    Is there a PCIe slot for an SSD instead of the SATA 3.0 2.5”?

    thank you,

    deejaysurfer - Reply

    The step-by-step guide was awesome and easy to follow. As others have commented, getting the SATA connector onto the SSD is tricky but not impossible. Just pull back the rubber bumpers long enough to reach the connector, then flip them back into place before seating the drive. One comment for my machine (late 2015 21.5”): There is no mic hole for my model, so while I was a little confused at the instructions on reinstalling the adhesive, the drive replacement went like a dream. And I saved myself the $120 labor the local Mac shop wanted to charge me.

    Glenn Pettit - Reply

    Hat alles prima funktioniert. Leider läuft der Lüfter jetzt auf 100% und kernel_task Prozess ist bei über 300%. Was habe ich falsch gemacht. Diagnose meldet jetzt einen SMC Fehler und CPU-Proximity liefert keinen Wert.

    Kann jemand helfen?

    Michael Schmitz - Reply

    This is the least accurately described step (sorry, author). While removal is easy, inserting the new drive in its place is a bit tricky. The key here, is to insert the new drive with its rubber bumpers back in its space, so that it is fully seated down in its place *before* the connector can be re-attached. Once it is seated in place, use the flat end of the spudger to gently manoeuver the connector back into place until it is firmly connected to the drive.

    Ernst - Reply

    Reassembling the iMac is not simply following these instructions in reverse order (sorry, author).

    Before embarking on the home stretch, it is very important to carefully study the guide about the Adhesive Strips Replacement (iMac Intel 21.5" Retina 4K Display (2017) Adhesive Strips Replacement - iFixit Repair Guide), as this a tedious and time consuming process. Perfect alignment of those adhesive strips takes some concentration, because you will want to have your display panel back nice and tight and fully aligned with the case. Once all strips are in place, the 2 display connectors need to be gently reattached to the motherboard, before closing up the panel. I took my sweet time for that step, and thankfully have a perfectly aligned display panel back in place looking no different from the factory fit.

    Ernst - Reply

    Here’s the rest of the information you need.

    https://www.youtube.com/watch?v=2xDJ28Oe...

    John Smith - Reply

    I got a 4 TB Seagate Barracuda HDD as a replacement for a client. (Going for capacity over speed.) Does anyone know if it will fit? It’s definitely fatter than the other HDD/SSDs I’ve installed before.

    David - Reply

    There needs to be more added to cover the first part of re-assembly. To connect up my SSD, I needed to remove screws that held in place the black plastic to the left of the drive bay. This was only way to get the added space needed to connect the SSD to the drive cable. I also connected the SSD first, then attached the rubber bumpers, simply to give me more room to maneuver the drive next to the connector. All in all, yes, a person well familiar with tearing down iMacs could do it in an hour or so. But frankly, the design of this iMac is a total horror show when it comes to repair or replacement of parts, especially given its reliance on glue and adhesives. Gee, just like other Apple products.

    Ben Myers - Reply

    Ben, after you replaced the HDD with SSD, did you have any fan issues on the A1418 model iMac? Thinking of doing this but I’ve been reading for hours and seeing mixed reports about thermal sensors.

    Christopher Henley -

    This iFixit tool (iFixit Opening Tool) will be your best friend when it's time to install your new 2.5" hard drive. Simply hook the tool to the back top corner of the iMac SATA adapter, connect your hard drive loosely to the SATA ports and use the tool to pull the SATA adapter forward into the hard drive.

    iannai29 - Reply

    After replacing the hard drive. All went well BUT -now my mic does not work. It's the single hole on the bottom. Any ideas anybody?

    Paolo Alberto - Reply

    Please update the end of this guide, pointing the customer to the guide for replacing the display adhesive strips. You provide a single kit for this procedure, and the customer has to figure out that they must follow two independent guides, in order to successfully complete the installation.

    Lewis Purvis - Reply

Conclusion

Compare your new replacement part to the original part—you may need to transfer remaining components or remove adhesive backings from the new part before installing.
To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Check out our Answers community for troubleshooting help.

7 other people completed this guide.

Adam O'Camb

Member since: 04/11/2015

165,947 Reputation

418 Guides authored

3 Comments

Great guide! I had a failing fusion drive and upgraded to an SSD and got the 64gb RAM maxxer kit while I was in there. everything went really smoothly and my computer is so much faster. My only mistake was that I didn’t clone the HDD before taking the imac apart. I had to put it all back together with the old drive, clone to the SSD, take it all apart again, replace the SSD, put it back together to verify that it was even gonna work, then take it all apart again to finish up the RAM upgrade. But… it’s all good. Thanks for the great guide!

Mark Pruett - Reply

You cannot replace a conventional “Hard drive” in this model iMac.

DO NOT attempt this upgrade until you understand two important facts:

1) The drive in your iMac MUST BE a ‘SSD’ or a ‘Fusion drive’. If it is a conventional HDD, stop. There is NO PCIe CONNECTOR inside to connect a new blade drive.

2) Click on the link in this iFixit for "clone your existing hard drive". All the more recent Apple CPU's are now classified as 'T2 secure chips'. Cloning is no longer straightforward, e.g. "Hold down Opt key during restart, etc." You have to bypass/disable certain security features on your iMac, and this is somewhat of a lengthy process. If you do not, when you try to boot from an external drive you will see nothing but a black screen.

Excellent step by step guide, thank you. I will definitely refer to this when I upgrade my 250G SSD which, BTW, is WAY too small. There's only 100G left, and only apps are Logic Pro X, Numbers/Keynote/Pages, iTunes & a few utilities... hardly any actual work

Anti Spam - Reply

Thanks for the information given. One follow-up question having a SSD-only 2019 iMac: Is the 2.5" harddrive enclosure and Sata-Cable included in this one? I would like to a) upgrade the PCIe-SSD but also put in a slightly bigger 2.5" SSD in place of the - currently non-existent - harddrive. Knowing Apple I am pretty sure that they did not include the Harddrive enclosure in SSD-only 2019 iMacs - plus using proprietary Sata connectors probably >.<

Joachim Schneider -

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