Review on Samsung 1TB SATA SSD MZ-77Q1T0BW by Wiktor wikliski ᠌

1. The key drawback is the QLC flash memory (Quad Level Cell - 4 bits per cell). From this follows the following: 1a). The speed outside of the DRAM buffer and SLC cache drops to 70MB / s with linear writes, which is lower than the speed of the "classic" HDD 5400rpm. The time it takes to transfer data from an old drive to a new drive can be an unpleasant surprise. 1b). Less resource of write cycles per cell compared to MLC and TLC. 1c). The lower ability of 4-bit flash cells to retain a charge for a long time compared to MLC and TLC, which will further lead to a faster decrease in the read speed of non-rewritable flash sections for a long time. There is little hope for the proprietary controller firmware that it can detect cells with long read delays and can “refresh the charge”. "But this is not accurate" (c). 2. SSD firmware conflicts with VirtualBox. When deploying any operating system on VDI (VirtualBox Disk Image), while saving the image file on the Samsung QVO870 SSD, the system inside the container starts to slow down wildly, up to errors. Checked multiple times. With the same program settings on an ADATA XPG SX8200 Pro SSD, WD Green VirtualBox works fine.