These recorded a DVCPro signal on interchangeable flash memory media. Relocating data increases write amplification and adds to the wear of flash memory. Overall, SD is less open than CompactFlash or USB flash memory drives. Kioxia's facilities for making its own flash memory chips. Each rover also has 256 MB of flash memory. Without access to flash memory the reboot cycle was broken. SandForce controllers compress the data before sending it to the flash memory. Kingston is arguably the second largest supplier of flash memory. In September 2017, Western Digital acquired Tegile Systems, maker of flash memory storage arrays. It displayed calendar software, Bluetooth, 8 MB RAM, and 16 MB of flash memory. It has 3 variants of storage&colon; 32,64, and 128GB of flash memory. The cost per gigabyte of flash memory remains significantly higher than that of hard disks. Flash memory cards and SSDs store data using multiple NAND flash memory chips. This led to Masuoka's invention of flash memory at Toshiba in 1980. Most of Western Digital's consumer flash memory products are offered through SanDisk.