BaseQiFBA iSDA504ASV Aluminum MicroSD Adapter for MacBook Pro 15" Retina (Late 2013 - Mid 2015)

I bought this for my 15 inch 2015 MPB I picked up from Ebay with no internal drive. I Installed a 128 GB drive from a previous upgrade from another Mac but needed something quick until I purchased another drive. I had several micro sd cards that I never use and decided to get this adapter. Put a 128 GB micro in this adapter and formatted it to apfs. So far it works great and it hasn't unmounted itself at all. It also fits my 14 inch 2021 Macbook Pro but sticks out just a little. It fits flush in my 2015 MBP.

I have an Acer Chromebook 15 CB5-571-C09S and just received this adapter. It works VERY nicely in my Chromebook. I verified before opening the package that this adapter was the right size and the right pin layout (it is perfect in both respects). I suspected and now have confirmed for myself the reason the adapter may not sit evenly in the slot as reported by another reviewer here. The slot in the Acer Chromebook is not EXACTLY the same shape at each end as this adapter is at the ends of the aluminum end cap, not quite as rounded. The result is that the adapter "wings" don't fit all the way in easily. You can do one of 2 things to fix: either trim the ends of the slot opening to be more rounded or fitted to the adapter, or gently file the aluminum "wings" just a little to fit the slot (what I did). Then it will fit perfectly. I know this will void any warranty on the item but I verified it is working before doing anything and test fitted many many times to ensure not to remove too much. There are still "wings" sticking out on each end of the adapter, just not quite as much as original. This adapter now fits perfectly even and flush in my Chromebook slot. OK, maybe not perfectly since there is a curve to the underside of the Acer that doesn't match the adapter perfectly but I really have to try to even feel it when I run my finger along the side of the Chromebook. I use a SanDisk Ultra 128GB micro SDXC card in the adapter and can now just leave it in there all the time. The finger nail slot works as advertised to remove it if that should ever need to be done.

First off, I tried several other types of MicroSD card adapters but none gave me much confidence either by way of build quality, performance or both. I spent the extra money on this adapter because I was at my wits end with the other four or five I had tried.As far as this adapter goes, the build quality is great, it fits perfectly, looks like it belongs where it is and is easy to remove when necessary. I am using a SanDisk 200GB MicroSD card and have had no performance issues.I use the drive to hold my iTunes library (north of 100GB) and some other media files and haven't had any troubles with the adapter. I have experienced slow downs with data transfer rates (attributed to the MicroSD card itself) but I benchmarked my MicroSD card with a USB adapter and a couple other SD card adapters including the BaseQi adapter and saw no performance impact using the BaseQi adapter versus the others.One thing I did notice that I determined to be attributed to Mac OS X and not the adapter is that the drive mould rarely remount after my computer woke up from any length of being asleep. After a bit of Google-Fu and testing other standard SD card adapters, I came to the conclusion that Mac OS X (I'm on 10.11.5 right now) is fickle about remounting SD cards after awaking from a sleep period regardless if you use the Power Nap feature or not. My solution that has worked out exceptionally well is to use an application called Jettison to remount the SD card after awaking from sleep.

This product is great! Once you install it, you'll forget that it is even there. Fits perfectly flush and you won't have to worry about it. You can use it with any MicroSD cardPro Tip: Do yourself a favor and get the highest capacity you can get and make sure it is at least SDXC, so you can get faster transfer rates. It is still going to be pretty slow compared to HD/SSD transfer rates, but it will be faster than other SD cards.

could not find the exact size for my macbook but it still worked just sticks out 2mm

This little device is terrific. If you have a MacBook Pro manufactured within the date range listed (mine is a late 2013 model), you take this little guy, pop in a 200Gb micro SDXC card, and slip it in the SDXC card slot of your Mac. You won't even see it, as it sits flush with the computer's body. Voila! My MacBook Pro now has an extra 200Gb of storage space! (I use mine to store my iTunes library, plus my iPhoto library.) It's great because it allows me to offload those files and buy back that space (my iTunes library at points has been around 150Gb since I have a lot of lossless ALAC and FLAC files in it.) But you can just as easily use it for anything else: documents storage, raw photos storage, etc. Since it's connected via the SDXC slot, as long as you are using a fast card, you get transfer rates that are quite acceptable should you ever need to copy or move between the card and the built in storage.It;s not all gravy. You are, of course, giving up your SDXC slot, so, should you need it to transfer photos, you'll either have to temporarily pull this card out, or transfer your photos via a USB-enabled card transfer device. But for me, this is not an issue, because having that extra space is much more important, and I can always transfer photos via USB. The cool thing is that it should not be too long before the 512Gb micro-SDXC cards are out, and then I'll be essentially increasing my internal storage space of my Mac by 50%! Talk about extending the life of a computer!The device itself is well constructed, and uses an aluminum front panel so that it perfectly matches the computer's case. No one will ever even notice it. I leave mine in all the time.This is an easy five-star device that offers great exansion capabilities at a reasonable price, and in a manner that blends right in with the Mac. I highly recommend it!