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3-year Accidental Damage insurance for a DATA STORAGE device from £60 to £69.99

from London General Insurance Company Ltd.
  • From the moment your product’s delivered it will be covered for accidental damage and any mechanical/electrical faults not covered by the manufacturer’s warranty. Cover is for UK residents who are over 18 years old.
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Protect your bubble.com 4-year Accidental Damage insurance for a DATA STORAGE device from £60 to £69.99

from London General Insurance Company Ltd.
  • From the moment your product’s delivered it will be covered for accidental damage and any mechanical/electrical faults not covered by the manufacturer’s warranty. Cover is for UK residents who are over 18 years old.
  • No added costs when making a claim; no excess to pay or any charges for parts, labour or callout.
  • Easy to make a claim by phone or email. If your product can’t be repaired, it will either be replaced or we’ll issue an Amazon e-gift card to the value of a replacement.
  • Cancel anytime: Full refund within 45 days if no claim has been made, pro-rated refund thereafter less claim costs.
  • For full product description, please read the Insurance Product Information Document and policy terms and conditions by following the link(s) provided. Please note that another insurance product which has different terms might be available on our website when accessed on a laptop or desktop PC.
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Add Extra Protection? Check if this cover meets your needs

  • From the moment your product’s delivered it will be covered for accidental damage and any mechanical/electrical faults not covered by the manufacturer’s warranty. Cover is for UK residents who are over 18 years old.
  • No added costs when making a claim; no excess to pay or any charges for parts, labour or callout.
  • Easy to make a claim by phone or email. If your product can’t be repaired, it will either be replaced or we’ll issue an Amazon e-gift card to the value of a replacement.
  • Cancel anytime: Full refund within 45 days if no claim has been made, pro-rated refund thereafter less claim costs.
  • For full product description, please read the Insurance Product Information Document and policy terms and conditions by following the link(s) provided. Please note that another insurance product which has different terms might be available on our website when accessed on a laptop or desktop PC.
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Crucial MX300 CT525MX300SSD1 525 GB Internal SSD (3D NAND, SATA, 2.5 Inch)

4.7 out of 5 stars 12,603 ratings

Price: £69.99
New (2) from £69.99 & FREE Delivery
525 GB
MX300

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  • Sequential reads/writes up to 530 / 510 MB/s on all file types
  • Random reads/writes up to 92k / 83k on all file types
  • Over 90x more energy efficient than a typical hard drive
  • Accelerated by Micron 3D NAND technology
  • Dynamic Write Acceleration technology delivers faster saves and file transfers
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  • Crucial MX300 CT525MX300SSD1 525 GB Internal SSD (3D NAND, SATA, 2.5 Inch)
  • +
  • Crucial BX500 240 GB CT240BX500SSD1-Up to 540 MB/s (Internal SSD, 3D NAND, SATA, 2.5 Inch), Black
  • +
  • Crucial RAM CT8G4SFRA32A 8GB DDR4 3200 MHz CL22 Laptop Memory
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Compare with similar items


Crucial MX300 CT525MX300SSD1 525 GB Internal SSD (3D NAND, SATA, 2.5 Inch)
Crucial MX500 500 GB CT500MX500SSD1-Up to 560 MB/s (3D NAND, SATA, 2.5 Inch, Internal SSD)
Kingston A400 SSD Internal Solid State Drive 2.5" SATA Rev 3.0, 480GB - SA400S37/480G
WD Blue SN550 500GB High-Performance M.2 PCIe NVME SSD
Customer Rating 4.7 out of 5 stars (12603) 4.8 out of 5 stars (44229) 4.8 out of 5 stars (10804) 4.8 out of 5 stars (5204)
Price £69.99 £45.38 £41.01 £42.98
Sold By Breakfree Retail Ltd. Amazon.co.uk Amazon.co.uk Amazon.co.uk
Data Transfer Rate 6 Gb per second 560 MB per second 450 Mb per second 8 Gb per second
Device Type Internal Internal Internal Solid State Drive Solid State Drive, Internal Drive
Digital Storage Capacity 525 GB 500 GB 480 GB 500 GB
Flash Memory Installed 525 GB 500 GB 480 GB 500
Hard Disk Size 525 GB 500 GB 480 GB
Item Dimensions 10.3 x 0.71 x 7 cm 10.3 x 0.71 x 7 cm 10.01 x 0.71 x 6.98 cm 8 x 2.2 x 0.24 cm
Item Weight 99.79 grams 10 grams 40.82 grams 7 grams
Memory Storage Capacity 525 GB 500 GB 480 GB 500 GB
Model Year 2016 2017 2017
Optical Storage Write Speed 510 MB/s 510 MB/s 450
Read Speed 530 MB per second 560 MB per second 500 MB per second 2400 MB per second
Size 525 GB 500 GB 480 GB 500GB

Product information

Capacity:525 GB  |  Style Name:MX300

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4.7 out of 5 stars
4.7 out of 5
12,603 global ratings
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Top reviews from United Kingdom

Reviewed in the United Kingdom on 5 April 2017
Capacity: 525 GBStyle Name: MX300Verified Purchase
19 people found this helpful
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Reviewed in the United Kingdom on 26 July 2017
Capacity: 525 GBStyle Name: MX300Verified Purchase
11 people found this helpful
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TOP 1000 REVIEWER
Reviewed in the United Kingdom on 9 September 2017
Verified Purchase
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5.0 out of 5 stars Works really well on laptops with Crucial momentum cache enabled
By ShammyB on 9 September 2017
I’ve been a big fan of Samsung drives, but the price difference on the 1TB was enough to make me jump ship to Crucial. I use it in a gaming laptop as my data drive (I have a 250GB system drive and then the Crucial 1TB for data, games and applications).

The laptop is a recent (2017) MSI Apache 17”. It has space for one PCIe SSD and one standard SATA 3. I chose to go with a standard SATA because I’m lazy and didn’t want to mess about with moving the system disk.

Anyway, all good, and decent for a SSD (but not outstanding figures) in CrystalDiskMark. That is until I downloaded Crucial Storage Executive and enabled momentum cache.

The figures speak for themselves (see my screenshot of CrystalDiskMark).

I've also added a second image from Task Manager showing how momentum cache works. The G drive is a traditional HDD transferring 25GB of data to F, a 1TB SSD with momentum enabled (I'm actually installing the game Fallout 4 from G to F). You can see that the SSD only occasionally writes data (about once every 10s).

So, a very good thing about Momentum cache is the way it handles small files; it caches them to memory and only writes them to the physical SSD occasionally. This not only saves wear on your SSD, but it also makes certain tasks fly. I am a web application developer, and my build process (which involves working with literally thousands of javascript files) is now super fast (it would be even faster if node/npm was multi-threaded, but that's another story!).

What are the downsides of doing this?

Momentum cache uses your PC memory as a read/write cache, so you need to have a decent amount of memory. My laptop has 16GB, so all good there. I suspect it will work less well for 4GB systems, or if you are using a power-hungry application (such as Adobe Premiere, which I use). It also increases the CPU overhead.
EDIT: I're realised Windows 10 Task Manager > Memory shows you the RAM cache (its marked as 'memory that has to be saved to disk before it can be used for something else' or words to that effect). I copied over the full install folder of Fallout 4 plus DLCs
(29.6GB) onto a Momemtum enabled drive and the cache varied between 1 and 1.5GB. So the 4GB is never reached; more like >2GB.

Crucial strongly recommend a battery backup if you use momentum cache (i.e. you can lose the cached data on a power fail), so other things equal you should only really enable it on a laptop.

The cache is written to the real SSD on power off, so system shutdown takes longer (by 5-10s, so significant).

But yeah, just look at those figures; well recommended for laptops with memory to spare; your system flies!

Edit: Another good thing about the Crucial I'm finding is that it uses devSleep much more often than other SSDs. Since writing this review (5 months), the up-time for my SSD (according to CrystalDiskInfo) is only 9 hours when the physical up-time has been office hours (8.5 hours a day, 5 days a week). The low up-time saves both power and wear and tear, with no noticeable affect on access time. DevSleep only seems to kick in on laptops (it does not seem to affect my desktop), but is certainly something that will extend your laptop battery life (especially if you have two drives) and the life of the SSDs themselves. Oh, I also suspect the up-time is coming out so low because of Momentum Cache (RAM caching means less access requests to the SSD and more devSleep down-time), so devSleep and Momentum cache probably work together).
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14 people found this helpful
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Reviewed in the United Kingdom on 3 May 2017
Capacity: 750 GBStyle Name: SATA 2.5 inchVerified Purchase
6 people found this helpful
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Reviewed in the United Kingdom on 4 January 2018
Capacity: 525 GBStyle Name: MX300Verified Purchase
One person found this helpful
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