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man fdisk
manipulate disk partition table
-l List the partition tables for the specified devices and then exit. If no devices are given, those mentioned in /proc/parti‐ tions (if that exists) are used.
get/set SATA/IDE device parameters
-t Perform timings of device reads for benchmark and comparison purposes. For meaningful results, this operation should be repeated 2-3 times on an otherwise inactive system (no other active processes) with at least a couple of megabytes of free memory. This displays the speed of reading through the buffer cache to the disk without any prior caching of data. This mea‐ surement is an indication of how fast the drive can sustain sequential data reads under Linux, without any filesystem over‐ head. To ensure accurate measurements, the buffer cache is flushed during the processing of -t using the BLKFLSBUF ioctl.