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As I had read contradictory information on this matter, I hot-plugged a spare cold storage SanDisk SSD Plus 2TB in a spare tray. This SSD seems to have the required features, even if DRZAT is called "Deterministic read data after TRIM" : root@NAS:~# hdparm -I /dev/sdj /dev/sdj: ATA device, with non-removable media Model Number: SanDisk SSD PLUS 2000GB Serial Number: 2025BG457713 Firmware Revision: UP4504RL Media Serial Num: Media Manufacturer: 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 0x0110) Supported: 10 9 8 7 6 5 Likely used: 10 Configuration: Logical max current cylinders 16383 0 heads 16 0 sectors/track 63 0 -- LBA user addressable sectors: 268435455 LBA48 user addressable sectors: 3907029168 Logical Sector size: 512 bytes Physical Sector size: 512 bytes Logical Sector-0 offset: 0 bytes device size with M = 1024*1024: 1907729 MBytes device size with M = 1000*1000: 2000398 MBytes (2000 GB) cache/buffer size = unknown Form Factor: 2.5 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 * 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 * 64-bit World wide name * WRITE_UNCORRECTABLE_EXT command * {READ,WRITE}_DMA_EXT_GPL commands * Segmented DOWNLOAD_MICROCODE unknown 119[8] * 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 * READ_LOG_DMA_EXT equivalent to READ_LOG_EXT Device-initiated interface power management * Software settings preservation Device Sleep (DEVSLP) * SANITIZE feature set * BLOCK_ERASE_EXT command * SET MAX SETPASSWORD/UNLOCK DMA commands * WRITE BUFFER DMA command * READ BUFFER DMA command * DEVICE CONFIGURATION SET/IDENTIFY DMA commands * Data Set Management TRIM supported (limit 8 blocks) <------ * Deterministic read data 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. Logical Unit WWN Device Identifier: 5001b444a7732960 NAA : 5 IEEE OUI : 001b44 Unique ID : 4a7732960 Device Sleep: DEVSLP Exit Timeout (DETO): 50 ms (drive) Minimum DEVSLP Assertion Time (MDAT): 31 ms (drive) Checksum: correct I mounted the drive with UD, and fstrim seems to work fine with my SAS2308 HBA (IT mode firmware 20.00.07.00) : root@NAS:~# fstrim -v /mnt/disks/WKSTN/ /mnt/disks/WKSTN/: 1.8 TiB (2000201273344 bytes) trimmed So maybe something has changed with the latest versions of the drivers ? That's beyond my technical skills, but I just wanted to report for others who would wonder about TRIM support behind this HBA/firmware couple. Thanks again for your help @JorgeB !