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Toshiba KBG30ZMT256G

The Toshiba KBG30ZMT256G is a small (M.2 22x42 mm) 256 GB solid state drive. It relies on the PCIe interface (NVMe protocol) for data transfer.

Notebookcheck says:

... this model is not at he same level as the top-of-the-range SSDs - Lenovo ThinkPad E590 Laptop Review | May 2019

TypeSSD
SizeM.2
Capacity256 GB
InterfaceNVMe
Announced17.12.2018

Benchmarks

AS SSD - Copy Game
min: 254.5     avg: 329.8     median: 329.8 (6%)     max: 405 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Copy Program
min: 94.3     avg: 129.9     median: 129.9 (5%)     max: 165.4 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Copy ISO
min: 448.1     avg: 490.1     median: 490.1 (2%)     max: 532 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Score Total
min: 1526     avg: 1616     median: 1616 (10%)     max: 1706 Points
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Score Write
min: 403     avg: 440.5     median: 440.5 (6%)     max: 478 Points
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Score Read
min: 749     avg: 786     median: 785.5 (13%)     max: 822 Points
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Access Time Write *
min: 0.176     avg: 0.2     median: 0.2 (0%)     max: 0.228 ms
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Access Time Read *
min: 0.057     avg: 0.1     median: 0.1 (0%)     max: 0.162 ms
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - 4K-64 Write
min: 231.7     avg: 272.9     median: 272.9 (5%)     max: 314.1 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - 4K-64 Read
min: 582     avg: 613     median: 612.5 (12%)     max: 643 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - 4K Write
min: 90.3     avg: 90.9     median: 91 (18%)     max: 91.6 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - 4K Read
min: 43.38     avg: 45.5     median: 45.5 (14%)     max: 47.61 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Sequential Write
min: 735     avg: 766     median: 766 (7%)     max: 797 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
AS SSD - Sequential Read
min: 1241     avg: 1279     median: 1278.5 (10%)     max: 1316 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - 4K QD32 Write
min: 165.6     avg: 230.3     median: 230.3 (21%)     max: 294.9 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - 4K QD32 Read
min: 270.9     avg: 410     median: 410 (32%)     max: 549 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - 4K Write
min: 90.8     avg: 94.4     median: 94.5 (3%)     max: 98.1 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - 4K Read
min: 44.39     avg: 48.1     median: 48.1 (1%)     max: 51.9 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - 512K Write
min: 501     avg: 583     median: 583 (6%)     max: 665 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - 512K Read
min: 585     avg: 653     median: 653 (14%)     max: 721 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - Sequential Write
min: 598     avg: 679     median: 678.5 (6%)     max: 759 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 3.0 - Sequential Read
min: 808     avg: 844     median: 844 (10%)     max: 880 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write 4K
min: 89.1     avg: 100.2     median: 100.2 (9%)     max: 111.2 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read 4K
min: 47.73     avg: 48.4     median: 48.4 (1%)     max: 49.01 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5 Write Seq
min: 586     avg: 669     median: 668.5 (4%)     max: 751 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5 Read Seq
min: 783     avg: 840     median: 839.5 (10%)     max: 896 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write 4K Q32T1
min: 200.2     avg: 231.6     median: 231.6 (5%)     max: 263 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read 4K Q32T1
min: 314.8     avg: 398.2     median: 398.2 (6%)     max: 481.5 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write Seq Q32T1
min: 784     avg: 792     median: 792 (5%)     max: 800 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read Seq Q32T1
min: 1544     avg: 1573     median: 1573 (8%)     max: 1602 MB/s
+ 2 benchmarks and specifications   + Show comparison chart
- Range of benchmark values
red legend - Average benchmark values
* Smaller numbers mean a higher performance

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v1.35
log 02. 20:52:56

#0 ran 0s before starting gpusingle class +0s ... 0s

#1 no ids found in url (should be separated by "_") +0s ... 0s

#2 not redirecting to Ajax server +0s ... 0s

#3 did not recreate cache, as it is less than 5 days old! Created at Fri, 27 Feb 2026 01:44:18 +0100 +0.002s ... 0.002s

#4 composed specs +0.003s ... 0.005s

#5 did output specs +0s ... 0.005s

#6 getting avg benchmarks for device 3261 +0.003s ... 0.007s

#7 got single benchmarks 3261 +0.006s ... 0.014s

#8 got avg benchmarks for devices +0s ... 0.014s

#9 min, max, avg, median took s +4.059s ... 4.073s

#10 return log +0.338s ... 4.411s

Notebook reviews with Toshiba KBG30ZMT256G

Lenovo ThinkPad E590 (i7, RX 550X, SSD, FHD) Laptop Review

Lenovo ThinkPad E590 (i7, RX 550X, SSD, FHD) Laptop Review

With the ThinkPad E590, Lenovo delivers a quiet workstation with very good keyboard and trackpad plus TrackPoint. The dedicated Radeon RX 550X GPU is only able to realise its potential for short periods of time, as the laptop's cooling system is not up to the task for longer sessions of use. This means that gaming is not really an option.
Intel Core i7-8565U, AMD Radeon RX 550X (Laptop), 15.6", 1.9 kg
Lenovo Yoga Book C930 (i5-7Y54, LTE, E-Ink) Convertible Review

Lenovo Yoga Book C930 (i5-7Y54, LTE, E-Ink) Convertible Review

The new Yoga Book has an E-Ink display instead of a keyboard and can be considered a combination of a laptop, a tablet and an e-reader. On top of that, you can also digitalize text and drawings with this all-rounder. The device is based on its predecessor from 2016 but offers many changes and improvements. For instance, it provides better performance. On the other hand, it has also dropped at least one feature. Is the 2018 Yoga Book worth twice the price of the old version? Find out in our detailed review.
Intel Core i5-7Y54, HD Graphics 615, 10.8", 778 g

Lenovo ThinkPad E590-20NB0012GE: Intel Core i7-8565U AMD Radeon RX 550X (Laptop), 15.60", 1.9 kg
  External Review » Lenovo ThinkPad E590-20NB0012GE

Lenovo Yoga Book C930 YB-J912F: Intel Core i5-7Y54 Intel HD Graphics 615, 10.80", 0.8 kg
  External Review » Lenovo Yoga Book C930 YB-J912F

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Klaus Hinum (Update: 2020-03- 1)