I have a SanDisk Extreme USB Flash Drive (http://www.sandisk.com/products/usb/drives/extreme/), which does NOT support UASP so is running under "usb-storage". According to `hdparm`, it seems to supports TRIM; and according to `sg3_opcodes`, it seems to support ATA Pass-Through (12/16). However, all TRIM/DISCARD related ioctl doesn't work with it at all. So my question is, is TRIM/DISCARD possible at all in linux for usb drives? If so, what are the requirements? If not, is it just not implemented yet or an inherit problem of usb which cannot be fixed? P.S. Although there's an SG_IO error, ATA Secure Erase seems to works according to hexdump, and the drive is NOT bricked after many trials. [tom@localhost ~]$ sudo blkdiscard /dev/sdc blkdiscard: /dev/sdc: BLKDISCARD ioctl failed: Operation not supported [tom@localhost ~]$ sudo blkdiscard -s /dev/sdc blkdiscard: /dev/sdc: BLKSECDISCARD ioctl failed: Operation not supported [tom@localhost ~]$ sudo mount /dev/sdc1 /mnt/ [tom@localhost ~]$ sudo fstrim /mnt/ fstrim: /mnt/: the discard operation is not supported [tom@localhost ~]$ sudo hdparm -I /dev/sdc /dev/sdc: ATA device, with non-removable media Model Number: SanDisk pSSD Serial Number: 0a1e4434c Firmware Revision: 3 Transport: Serial, ATA8-AST, SATA Rev 2.6 Standards: Used: ATA-8-ACS revision 2d Supported: 8 7 6 5 Configuration: Logical max current cylinders 16383 16383 heads 16 16 sectors/track 63 63 -- CHS current addressable sectors: 16514064 LBA user addressable sectors: 61282631 LBA48 user addressable sectors: 61282631 Logical Sector size: 512 bytes Physical Sector size: 512 bytes device size with M = 1024*1024: 29923 MBytes device size with M = 1000*1000: 31376 MBytes (31 GB) cache/buffer size = unknown Form Factor: 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, no device specific minimum R/W multiple sector transfer: Max = 1 Current = 1 Advanced power management level: disabled 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 * 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|MULTIPLE}_FUA_EXT * 64-bit World wide name * WRITE_UNCORRECTABLE_EXT command * 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) * Software settings preservation * DEVICE CONFIGURATION SET/IDENTIFY DMA commands * Data Set Management TRIM supported (limit 8 blocks) * Deterministic read ZEROs after TRIM Security: Master password revision code = 65534 supported not enabled not locked not frozen not expired: security count not supported: enhanced erase 2min for SECURITY ERASE UNIT. 2min for ENHANCED SECURITY ERASE UNIT. Logical Unit WWN Device Identifier: 5001b400e4a14c43 NAA : 5 IEEE OUI : 001b40 Unique ID : 0e4a14c43 Checksum: correct [tom@localhost ~]$ sudo sg_opcodes /dev/sdc SanDisk Extreme 0001 Peripheral device type: disk Opcode Service CDB Name (hex) action(h) size ----------------------------------------------- 00 6 Test Unit Ready 03 6 Request Sense 04 6 Format Unit 08 6 Read(6) 0a 6 Write(6) 12 6 Inquiry 15 6 Mode select(6) 1a 6 Mode sense(6) 1b 6 Start stop unit 1d 6 Send diagnostic 1e 6 Prevent allow medium removal 23 10 Read Format capacities 25 10 Read capacity(10) 28 10 Read(10) 2a 10 Write(10) 2f 10 Verify(10) 35 10 Synchronize cache(10) 3b 10 Write buffer 3c 10 Read buffer 43 10 Read TOC/PMA/ATIP 55 10 Mode select(10) 5a 10 Mode sense(10) 85 16 ATA pass-through(16) 88 16 Read(16) 8a 16 Write(16) 8f 16 Verify(16) 91 16 Synchronize cache(16) 9e 10 16 Read capacity(16) a0 12 Report luns a1 12 ATA pass-through(12) a2 12 Security protocol in a3 c 12 Report supported operation codes a8 12 Read(12) aa 12 Write(12) af 12 Verify(12) [tom@localhost ~]$ sudo hdparm --security-set-pass wipe /dev/sdc security_password: "wipe" /dev/sdc: Issuing SECURITY_SET_PASS command, password="wipe", user=user, mode=high [tom@localhost ~]$ sudo hdparm --security-erase wipe /dev/sdc security_password: "wipe" /dev/sdc: Issuing SECURITY_ERASE command, password="wipe", user=user SG_IO: bad/missing sense data, sb[]: f0 00 01 00 50 40 00 0a 00 00 00 00 00 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
