Kingston A400240 GB · 2.5-inch standalone SATA · SA400S37/240G- Capacity
- 240 GBThis one: 250 GB
- Rated sequential read
- 500 MB/sThis one: 540 MB/s
STORAGE
Samsung 850 EVO
250 GB · 2.5-inch SATA · Samsung part MZ-75E250BW
- Capacity
- 250 GB
- SSD / HDD
- SSD
- Form factor
- 2.5-inch
A 250 GB 2.5-inch SATA SSD rated up to 540 MB/s read and 520 MB/s write, with TLC V-NAND, 512 MB LPDDR3 cache and a 75 TB write rating.
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THE ACTUAL PRODUCT
Compare with Kingston A400
Specifications checked 11 Sept 2026Manufacturer specifications, not a hands-on test.
The nearest checked drives by key specifications, with what differs from the Samsung 850 EVO. The first matches the Compare button above.
Kingston A400240 GB · 2.5-inch standalone SATA · SA400S37/240G
Samsung 860 EVO1 TB · 2.5-inch SATA · MZ-76E1T0BW- Capacity
- 1000 GBThis one: 250 GB
- Rated sequential read
- 550 MB/sThis one: 540 MB/s
Kingston KC6001024 GB · 2.5-inch SATA · SKC600/1024G- Capacity
- 1024 GBThis one: 250 GB
- Rated sequential read
- 550 MB/sThis one: 540 MB/s
Key strengths
Rated up to 540 MB/s sequential read and 520 MB/s sequential write, with a 512 MB LPDDR3 DRAM cache and TLC V-NAND.
Before you buy
Writes drop from 520 MB/s to 300 MB/s once the TurboWrite cache fills, and the warranty covers only 75 TB written. It needs a 2.5-inch bay with SATA data and power connections.
Every specification. With its source.
Full specifications
Exact configuration: 250 GB · 2.5-inch SATA · MZ-75E250BW
47 specifications in 7 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.
Capacity & format
12 items
- Capacity
- 250 GB
Decimal capacity; formatting and system use reduce available space.
- SSD / HDD
- SSDSource
- Form factor
- 2.5-inch
Match the physical format and electrical interface to the host.
- Interface and version
- SATA 6 Gb/s
Backward compatible with SATA 3 Gb/s and 1.5 Gb/s. · Requires compatible SATA data and power connections; link rate is not an application-performance result.
- DRAM cache present
- Yes
Onboard DRAM listed; not host memory or the TurboWrite region.
Source - Enclosure dimensions
- 100 × 69.85 × 6.8 mm
Manufacturer dimensions; confirm installation clearance.
- NAND type
- Samsung V-NAND TLC
Manufacturer calls this three-bit MLC; Samsung glossary identifies three bits per cell as TLC. Samsung does not give the layer count.
- Cache arrangement
- 512 MB LPDDR3 DRAM
Manufacturer's stated DRAM cache capacity for this storage capacity.
- Controller
- Samsung MGX
The 250 GB model uses MGX; the 2 TB and 4 TB models use MHX.
Source - DRAM cache capacity
- 512 MB
512 MB LPDDR3 on the 250 GB model.
Source - Thermal protection
- Dynamic Thermal Guard
Samsung's Ukrainian product page names Dynamic Thermal Guard.
Source - Maximum drive weight
- 41 g
The 250 GB Ukrainian page states maximum 41.0 g. The family PDF lists a 55 g maximum across capacities.
Performance
11 items
- Rated sequential read
- 540 MB/s
Samsung CrystalDiskMark 3.0.1 sequential claims: Core i7-4790K, 8 GB DDR3-1600, Intel Z97PRO, Windows 7 Ultimate SP1, Intel RST 13.0.3.1001. Writes use TurboWrite; peak rates depend on firmware, host, workload and cache state.
Source - Rated sequential write
- 520 MB/s
Samsung CrystalDiskMark 3.0.1 sequential claims: Core i7-4790K, 8 GB DDR3-1600, Intel Z97PRO, Windows 7 Ultimate SP1, Intel RST 13.0.3.1001. Writes use TurboWrite; peak rates depend on firmware, host, workload and cache state.
Source - Rated performance and conditions
- Up to 540 MB/s sequential read; up to 520 MB/s cached sequential write; 300 MB/s after TurboWrite
Samsung CrystalDiskMark 3.0.1 sequential claims: Core i7-4790K, 8 GB DDR3-1600, Intel Z97PRO, Windows 7 Ultimate SP1, Intel RST 13.0.3.1001. Writes use TurboWrite; peak rates depend on firmware, host, workload and cache state.
- Rated write after TurboWrite
- 300 MB/s
250 GB after-buffer manufacturer claim is 300 MB/s under CDM3/i7-4790K/Z97PRO/8 GB/Windows 7 SP1 conditions. Peak 520 is cached.
Source - Rated random read
- 97000 IOPS
Manufacturer IOmeter 1.1.0, 4 KB QD32, i7-4790K / 8 GB DDR3-1600 / Z97PRO / Windows 7 Ultimate SP1 / Intel RST 13.0.3.1001; TurboWrite and firmware/host limitations apply.
Source - Rated random write
- 88000 IOPS
Manufacturer IOmeter 1.1.0, 4 KB QD32, i7-4790K / 8 GB DDR3-1600 / Z97PRO / Windows 7 Ultimate SP1 / Intel RST 13.0.3.1001; TurboWrite and firmware/host limitations apply.
Source - Rated random read, QD1
- 10000 IOPS
4 KB QD1 manufacturer claim under the stated IOmeter host conditions; not observed application latency.
Source - Rated random write, QD1
- 40000 IOPS
Capacity 4 KB QD1 manufacturer claim under the stated IOmeter/TurboWrite conditions.
Source - Write-buffer technology
- TurboWrite
SLC-style write-buffer feature named by manufacturer; capacity-specific post-buffer performance is shown separately. Samsung does not give the buffer size or a sustained write guarantee.
- Published write-buffer capacity
- Not listed by the manufacturer
Samsung does not state this for this model. · Samsung does not list the TurboWrite buffer size for the 250 GB model.
- RAPID host-memory caching
- Yes
Ukrainian page advertises RAPID using free system memory. This is separate from onboard DRAM and raw SSD rates; Samsung's historical PCMark7 uplift is not a like-for-like drive benchmark. Check current software and operating-system requirements.
Source
Endurance & warranty
5 items
- Warranty write threshold
- 75 TB
Capacity-specific warranty write threshold, not a guaranteed failure point.
- Limited warranty time
- 5 years
Time limit, not predicted lifespan; coverage also ends at the TBW threshold and is subject to full terms.
- Warranty terms and endurance if applicable
- 5 years or 75 TB written, whichever comes first; limited-warranty terms apply
Manufacturer coverage is subject to purchase eligibility and applicable terms. A used drive may have less coverage left.
- Manufacturer application scope
- Client PCs
Requires correct SATA connections, host and clearance; no universal NAS compatibility.
Source - Manufacturer MTBF rating
- 1,500,000 hours
Statistical manufacturer rating, not lifetime of an individual drive.
Source
Power
5 items
- Published power conditions
- 2.2 W average; 2.4 W maximum burst; up to 50 mW idle; 2 mW device sleep
Ukrainian 250 GB page supplies average/burst/idle; PDF supplies 250 GB sleep. The PDF's 3.1/3.6 W active and 70 mW idle figures apply to the 4 TB model. Page does not publish its active test host. Not constant household consumption.
- Published burst power
- 2.4 W
Regional product page maximum burst claim; not average or a constant operating load.
Source - Allowable supply voltage
- 5 V ±5%
250 GB page states 5 V ±5%.
- Device sleep support
- Yes
The regional product page supports device sleep. Host and operating-system support are required; the separately specified sleep-power claim is not measured laptop battery life.
Source - Published system-level power
- 2.2 W average; 2.4 W maximum in burst mode
The Ukrainian page labels 2.2 W as a system-level average and 2.4 W as burst maximum. Hardware and configuration affect consumption.
Source
Features & software
8 items
- Hardware encryption support
- AES-256; TCG Opal 2.0; IEEE 1667
Supported capability, not automatically enabled security or universal host compatibility.
Source - TRIM support
- Yes
Manufacturer requires OS support.
Source - S.M.A.R.T. support
- Yes
Monitoring support, not a remaining-life guarantee.
Source - Garbage collection
- Yes
Internal feature, not a quantified application benefit.
Source - Queued TRIM capability
- Not listed by the manufacturer
Samsung does not state this for this model. · Basic TRIM depends on operating-system support; Samsung does not state queued TRIM for this version.
Source - Drive management software
- Samsung Magician
Manufacturer lists Magician and Data Migration. Check the current software version and its requirements. No latest-version claim.
Source - PSID crypto erase
- Yes
Rev3.1 security feature page mentions PSID crypto erase. Requires the appropriate procedure; not equivalent to encryption already being active.
Source - World Wide Name support
- Yes
Regional page lists WWN support.
Source
Environment & reliability
5 items
- Operating temperature
- 0–70 °C
Manufacturer operating range; not a measured load temperature.
- Storage temperature
- −40–85 °C
Manufacturer non-operating envelope.
Source - Non-condensing humidity range
- 5–95%
Manufacturer specifies non-condensing conditions. This environmental range is not waterproofing or an IP rating.
Source - Non-operating shock rating
- 1500 G; 0.5 ms; three axes
Manufacturer non-operating test, not a system drop guarantee.
Source - Non-operating vibration rating
- 20 G; 20–2000 Hz
Test envelope.
Source
Compatibility & box
1 item
- Installation kit included
- No
Regional product page says no installation kit. Listed box contents do not mention SATA cables or mounting hardware.
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