I just discovered that the hdparm secure erase will always work on one bay of the two bay device. Fortunately I discovered while erasing two HDDs so no damage was done.
CODE
# dmesg -w (...) [ 6592.947151] [ T2848] usb 1-1.3: new high-speed USB device number 7 using ehci-pci [ 6593.035840] [ T2848] usb 1-1.3: New USB device found, idVendor=152d, idProduct=2352, bcdDevice= 0.00 [ 6593.035852] [ T2848] usb 1-1.3: New USB device strings: Mfr=10, Product=11, SerialNumber=5 [ 6593.035857] [ T2848] usb 1-1.3: Product: 2Bay Duplicator [ 6593.035860] [ T2848] usb 1-1.3: Manufacturer: SSI Computer corp [ 6593.035863] [ T2848] usb 1-1.3: SerialNumber: (redacted) [ 6593.036766] [ T2848] usb-storage 1-1.3:1.0: USB Mass Storage device detected [ 6593.037320] [ T2848] scsi host9: usb-storage 1-1.3:1.0 [ 6594.076221] [ T20841] scsi 9:0:0:0: Direct-Access SAMSUNG MZ7TY128HDHP-000 PQ: 0 ANSI: 2 CCS [ 6594.077099] [ T20841] scsi 9:0:0:1: Direct-Access SAMSUNG MZ7TY128HDHP-000 PQ: 0 ANSI: 2 CCS [ 6594.077538] [ T20841] sd 9:0:0:0: Attached scsi generic sg10 type 0 [ 6594.077914] [ T20841] sd 9:0:0:1: Attached scsi generic sg11 type 0 [ 6594.079169] [ T18569] sd 9:0:0:0: [sdj] 250069680 512-byte logical blocks: (128 GB/119 GiB) [ 6594.080270] [ T18569] sd 9:0:0:0: [sdj] Write Protect is off [ 6594.080281] [ T18569] sd 9:0:0:0: [sdj] Mode Sense: 34 00 00 00 [ 6594.082761] [ T22911] sd 9:0:0:1: [sdk] 250069680 512-byte logical blocks: (128 GB/119 GiB) [ 6594.083882] [ T18569] sd 9:0:0:0: [sdj] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 6594.084993] [ T22911] sd 9:0:0:1: [sdk] Write Protect is off [ 6594.084999] [ T22911] sd 9:0:0:1: [sdk] Mode Sense: 34 00 00 00 [ 6594.085994] [ T22911] sd 9:0:0:1: [sdk] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 6594.115768] [ T18569] sdj: sdj1 sdj2 sdj3 [ 6594.116141] [ T18569] sd 9:0:0:0: [sdj] Attached SCSI disk [ 6594.117641] [ T22911] sd 9:0:0:1: [sdk] Attached SCSI disk ^C # # hdparm --user-master u --security-set-pass password /dev/sdk security_password: "password" /dev/sdk: Issuing SECURITY_SET_PASS command, password="password", user=user, mode=high # hdparm --user-master u --security-erase password /dev/sdk security_password: "password" /dev/sdk: Issuing SECURITY_ERASE command, password="password", user=user fdisk -l /dev/sdj Disk /dev/sdj: 119.24 GiB, 128035676160 bytes, 250069680 sectors Disk model: MZ7TY128HDHP-000 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes # smartctl /dev/sdj smartctl 7.5 2025-04-30 r5714 [x86_64-linux-6.18.6-1-default] (SUSE RPM) Copyright (C) 2002-25, Bruce Allen, Christian Franke, www.smartmontools.org Smartctl open device: /dev/sdj [USB JMicron] failed: Two devices connected, try '-d usbjmicron,[01]' The device /dev/sdj, when discovered by the kernel, still has the four partitions. When the secure erase on /dev/sdk was issued, the data on /dev/sdj were gone. Then I called smartctl to show that it's recognizing the JMicron controller and refuses to send the commands.
I discovered the bug because I already had tried to erase the disks but only one would be erased. So I swapped both disks and did the above test. (Knowing the JMicron problem with smartctl it was an easy guess)
Unfortunately I'm using OpenSUSE and their login doesn't work correctly right now; also hdparm is hosted on
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