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Toshiba BG4 KBG40ZNS128G

The Toshiba KBG40ZNS128G is a very compact (single side M.2 22x30 mm) SSD for tablets, laptops, IoT devices. We found the 128 GB drive's performance to be subpar in our independent testing conducted in 2019.

Performance

The NVMe class drive (PCI-E 3.0 x4) fell short of its rated capabilities in our testing. While Toshiba/Kioxia promises read and write rates of up to 2000 MB/s and 800 MB/s respectively, the real world results do not get anywhere near those targets, lagging behind many SATA III class drives in a few scenarios.

Power Consumption

The consumption should be relatively low at around 3 W (according to the manufacturer). Nonetheless, the drive will probably see a lot of thermal throttling throughout its useful life span, just as most M.2 SSDs do.

Notebookcheck says:

... While sequential read rates on the SSD are decent at about 1200 MB/s, sequential write rates are slower than even most SATA III SSDs at just under 200 MB/s. This is a budget drive after all with similar results to the Toshiba BG3 found on the Dell G7 17 7790 - Dell G3 15 3590 Laptop Review, 2019

TypeSSD
SizeM.2
Interface
Announced07.10.2019
LinkToshiba BG4 KBG40ZNS128G

Benchmarks

Performance Rating - DiskSpd
20.3 pt (22%)
SK Hynix PC401 512GB M.2 (HFS512GD9TNG) -84%
...
Apple SSD SM0256F -41%
Lenovo UMIS AM610 RPFTJ256PDD2MWX -34%
Samsung SSD PM871b MZNLN256HAJQ -21%
Apple SSD AP0256 -15%
Toshiba BG4 KBG40ZNS128G
SK hynix BC501 HFM256GDGTNG 1%
256 GB NVMe 2%
Intel SSD 600p SSDPEKKW512G7 2%
Toshiba KBG30ZMV256G 11%
Toshiba KBG30ZPZ128G 15%
Apple SSD SM0512F 20%
Apple SSD AP0512 23%
...
0%
100%
AS SSD - Copy Game
min: 165.88     avg: 171     median: 171 (3%)     max: 176.04 MB/s
AS SSD - Copy Program
min: 108.17     avg: 136     median: 135.6 (5%)     max: 162.99 MB/s
AS SSD - Copy ISO
min: 215.73     avg: 216     median: 216.3 (6%)     max: 216.77 MB/s
AS SSD - Score Total
min: 987     avg: 1136     median: 1135.5 (13%)     max: 1284 Points
AS SSD - Score Write
min: 157     avg: 273     median: 273 (6%)     max: 389 Points
AS SSD - Score Read
min: 575     avg: 595     median: 595 (21%)     max: 615 Points
AS SSD - Access Time Write *
min: 0.181     avg: 0.6     median: 0.6 (0%)     max: 0.94 ms
AS SSD - Access Time Read *
min: 0.124     avg: 0.1     median: 0.1 (0%)     max: 0.168 ms
AS SSD - 4K-64 Write
min: 68.84     avg: 136     median: 135.9 (4%)     max: 203.02 MB/s
AS SSD - 4K-64 Read
min: 423.96     avg: 443     median: 442.6 (19%)     max: 461.18 MB/s
AS SSD - 4K Write
min: 69.36     avg: 118     median: 117.5 (1%)     max: 165.72 MB/s
AS SSD - 4K Read
min: 34.01     avg: 36.8     median: 36.8 (14%)     max: 39.5 MB/s
AS SSD - Sequential Write
min: 185.96     avg: 193     median: 192.9 (5%)     max: 199.77 MB/s
AS SSD - Sequential Read
min: 1141.89     avg: 1158     median: 1158 (21%)     max: 1174.13 MB/s
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write 4K
139 MB/s (13%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read 4K
42 MB/s (1%)
CrystalDiskMark 5.2 / 6 - CDM 5 Write Seq
214 MB/s (5%)
CrystalDiskMark 5.2 / 6 - CDM 5 Read Seq
1289 MB/s (24%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write 4K Q32T1
158 MB/s (9%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read 4K Q32T1
449 MB/s (28%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write Seq Q32T1
211 MB/s (4%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read Seq Q32T1
1853 MB/s (21%)
DiskSpd - DiskSpd 4k_q1t1_write
121 MB/s (46%)
DiskSpd - DiskSpd 4k_q1t1_read
34.6 MB/s (12%)
DiskSpd - DiskSpd 4k_q32t16_write
163 MB/s (5%)
DiskSpd - DiskSpd 4k_q32t16_read
497 MB/s (17%)
DiskSpd - DiskSpd seq_write
240 MB/s (6%)
DiskSpd - DiskSpd seq_read
1336 MB/s (32%)
DiskSpd - DiskSpd seq_q8t1_write
241 MB/s (5%)
DiskSpd - DiskSpd Loop seq_q8t1_read
1274 MB/s (19%)
01002003004005006007008009001000110012001300140015001600170018001900Tooltip
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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Notebook reviews with Toshiba BG4 KBG40ZNS128G

Dell G3 3590: Intel Core i5-9300H NVIDIA GeForce GTX 1650 Mobile, 15.60", 2.5 kg
  Review » Dell G3 15 3590 Laptop Review: Inexpensive with Easy Upgrades

Dell Inspiron 15 5000 5502: Intel Core i3-1115G4 Intel UHD Graphics Xe G4 48EUs, 15.60", 1.6 kg
  Review » Dell Inspiron 15 5502 Laptop Review: Intel 11th Gen For The Masses

Dell G3 3590: Intel Core i5-9300H NVIDIA GeForce GTX 1650 Mobile, 15.60", 2.5 kg
  External Review » Dell G3 3590

Dell Inspiron 15 5000 5502: Intel Core i3-1115G4 Intel UHD Graphics Xe G4 48EUs, 15.60", 1.6 kg
   » Dell Inspiron 5000 5505 with Ryzen 5 undercuts the Intel Core i5 version by over $100 USD, now on sale for $489 USD

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> Notebook / Laptop Reviews and News > Benchmarks / Tech > Laptop harddisks (HDD, SSD) benchmarks > Toshiba BG4 KBG40ZNS128G Benchmarked
Klaus Hinum (Update: 2020-03- 1)