Это Вы к тому, что нужно время от времени прогонять short/long test?
Так вот на этом самом проблемном SSD он проходит без ошибок:

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%     37246         -
# 2  Short offline       Completed without error       00%     37246         -
# 3  Extended offline    Completed without error       00%      8279         -

при чтении:

~ # dd if=/dev/sdb of=/dev/null bs=32M
dd: error reading '/dev/sdb': Input/output error
13+1 records in
13+1 records out
464543744 bytes (465 MB, 443 MiB) copied, 2,70164 s, 172 MB/s

вывод dmesg:

[477340.154080] ata6.00: exception Emask 0x0 SAct 0x10000 SErr 0x0 action 0x0
[477340.154083] ata6.00: irq_stat 0x40000008
[477340.154087] ata6.00: failed command: READ FPDMA QUEUED
[477340.154094] ata6.00: cmd 60/08:80:30:d8:0d/00:00:00:00:00/40 tag 16 ncq dma 4096 in
                         res 41/40:80:30:d8:0d/00:00:00:00:00/40 Emask 0x409 (media error) <F>
[477340.154096] ata6.00: status: { DRDY ERR }
[477340.154098] ata6.00: error: { UNC }
[477340.154692] ata6.00: configured for UDMA/100
[477340.154703] sd 5:0:0:0: [sdb] tag#16 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[477340.154707] sd 5:0:0:0: [sdb] tag#16 Sense Key : Medium Error [current]
[477340.154710] sd 5:0:0:0: [sdb] tag#16 Add. Sense: Unrecovered read error - auto reallocate failed
[477340.154713] sd 5:0:0:0: [sdb] tag#16 CDB: Read(10) 28 00 00 0d d8 30 00 00 08 00
[477340.154715] print_req_error: I/O error, dev sdb, sector 907312
[477340.154717] Buffer I/O error on dev sdb, logical block 113414, async page read
[477340.154728] ata6: EH complete

P.S. смена шлейфа не меняет ситуацию.