It is turned off by default, but you can turn it and use between 1-50% of the drives capacity for over-provisioning.Hdparm -I /dev/sdb /dev/sdb: ATA device, with non-removable media Model Number: Crucial_CT128M550SSD4 Serial Number: ************ Firmware Revision: MU01 Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0 Standards: Used: unknown (minor revision code 0x0028) Supported: 9 8 7 6 5 Likely used: 9 Configuration: Logical max current cylinders 16383 16383 heads 16 16 sectors/track 63 63 - CHS current addressable sectors: 16514064 LBA user addressable sectors: 250069680 LBA48 user addressable sectors: 250069680 Logical Sector size: 512 bytes Physical Sector size: 4096 bytes Logical Sector-0 offset: 0 bytes device size with M = 1024*1024: 122104 MBytes device size with M = 1000*1000: 128035 MBytes (128 GB) cache/buffer size = unknown Form Factor: less than 1.8 inch Nominal Media Rotation Rate: Solid State Device Capabilities: LBA, IORDY(can be disabled) Queue depth: 32 Standby timer values: spec'd by Standard, with device specific minimum R/W multiple sector transfer: Max = 16 Current = 16 Advanced power management level: 254 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns Commands/features: Enabled Supported: * SMART feature set * Security Mode feature set * Power Management feature set * Write cache * Look-ahead * Host Protected Area feature set * WRITE_BUFFER command * READ_BUFFER command * NOP cmd * DOWNLOAD_MICROCODE * Advanced Power Management feature set SET_MAX security extension * 48-bit Address feature set * Device Configuration Overlay feature set * Mandatory FLUSH_CACHE * FLUSH_CACHE_EXT * SMART error logging * SMART self-test * General Purpose Logging feature set * WRITE_DMA_EXT_GPL commands * Segmented DOWNLOAD_MICROCODE * Gen1 signaling speed (1.5Gb/s) * Gen2 signaling speed (3.0Gb/s) * Gen3 signaling speed (6.0Gb/s) * Native Command Queueing (NCQ) * Phy event counters * NCQ priority information * READ_LOG_DMA_EXT equivalent to READ_LOG_EXT * DMA Setup Auto-Activate optimization Device-initiated interface power management Asynchronous notification (eg. If you are worried about your drives endurance and have room to spare you’ll want to enable over-provisioning in Crucial Storage Executive. Some insane numbers, but keep in mind that this is mostly the DRAM here and changing the memory frequency will drastically change these numbers. ![]() We did a quick test with Crucial Momentum Cache enabled on a secondary drive and found that our 4K read performance went from 31 MB/s to 664 MB/s and our sequential read speed went from 434 MB/s to 6,068 MB/s. Once the system comes back on you should see faster performance straight away if you enabled on on your primary C: drive. ![]() To enable Momentum Cache you just need to click one button in Storage Executive and then follow the prompts to restart the system. This increased the storage systems burst speed by up to 10x and helps reduce wear on the 3D TLC NAND Flash as the random data is being written to the DRAM instead. This is because Crucial Momentum Cache allows enhanced drive performance by allowing your systems DRAM to bugger random data writes instead of writing them to the the SSD. The Crucial MX300 ships with Momdemtum Cache disabled and we don’t advise enabling it unless you do daily backups and have a battery backup for your system. It also allows you to sanitize the drive (secure erase), setup encryption, enable Momentum Cache and change the drives Over Provisioning settings. ![]() This free download ensures you are getting the most out of your MX300 series SSD by allowing you to monitor your SSD performance, health, temperature, see how much space is used and update the firmware. On of the best things about the Crucial MX300 series is that you can download Crucial Storage Executive software application.
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