[Nexus 7 (2013) Q&A] bl4cKz4cK:
root@TECRA:~# fastboot oem gpt-info
...
(bootloader)	partition[1].name = radio
(bootloader)	partition[1].first_lba = 131072
(bootloader)	partition[1].last_lba = 306143
(bootloader)	partition[1].size 87536 KB
(bootloader)	partition[2].name = modemst1
(bootloader)	partition[2].first_lba = 393216
(bootloader)	partition[2].last_lba = 399359
(bootloader)	partition[2].size 3072 KB
(bootloader)	partition[3].name = modemst2
(bootloader)	partition[3].first_lba = 399360
(bootloader)	partition[3].last_lba = 405503
(bootloader)	partition[3].size 3072 KB
(bootloader)	partition[4].name = persist
(bootloader)	partition[4].first_lba = 524288
(bootloader)	partition[4].last_lba = 554287
(bootloader)	partition[4].size 15000 KB
(bootloader)	partition[5].name = m9kefs1
(bootloader)	partition[5].first_lba = 655360
(bootloader)	partition[5].last_lba = 656919
(bootloader)	partition[5].size 780 KB
(bootloader)	partition[6].name = m9kefs2
(bootloader)	partition[6].first_lba = 656920
(bootloader)	partition[6].last_lba = 658479
(bootloader)	partition[6].size 780 KB
(bootloader)	partition[7].name = m9kefs3
(bootloader)	partition[7].first_lba = 786432
(bootloader)	partition[7].last_lba = 787991
(bootloader)	partition[7].size 780 KB
(bootloader)	partition[8].name = fsg
(bootloader)	partition[8].first_lba = 787992
(bootloader)	partition[8].last_lba = 794135
(bootloader)	partition[8].size 3072 KB
(bootloader)	partition[9].name = sbl1
(bootloader)	partition[9].first_lba = 917504
(bootloader)	partition[9].last_lba = 920503
(bootloader)	partition[9].size 1500 KB
(bootloader)	partition[10].name = sbl2
(bootloader)	partition[10].first_lba = 920504
(bootloader)	partition[10].last_lba = 923503
(bootloader)	partition[10].size 1500 KB
(bootloader)	partition[11].name = sbl3
(bootloader)	partition[11].first_lba = 923504
(bootloader)	partition[11].last_lba = 927599
(bootloader)	partition[11].size 2048 KB
(bootloader)	partition[12].name = aboot
(bootloader)	partition[12].first_lba = 927600
(bootloader)	partition[12].last_lba = 937839
(bootloader)	partition[12].size 5120 KB
(bootloader)	partition[13].name = rpm
(bootloader)	partition[13].first_lba = 937840
(bootloader)	partition[13].last_lba = 938863
(bootloader)	partition[13].size 512 KB
(bootloader)	partition[14].name = boot
(bootloader)	partition[14].first_lba = 1048576
(bootloader)	partition[14].last_lba = 1081343
(bootloader)	partition[14].size 16384 KB
(bootloader)	partition[15].name = tz
(bootloader)	partition[15].first_lba = 1179648
(bootloader)	partition[15].last_lba = 1180671
(bootloader)	partition[15].size 512 KB
(bootloader)	partition[16].name = pad
(bootloader)	partition[16].first_lba = 1180672
(bootloader)	partition[16].last_lba = 1180673
(bootloader)	partition[16].size 1 KB
(bootloader)	partition[17].name = sbl2b
(bootloader)	partition[17].first_lba = 1180674
(bootloader)	partition[17].last_lba = 1183673
(bootloader)	partition[17].size 1500 KB
(bootloader)	partition[18].name = sbl3b
(bootloader)	partition[18].first_lba = 1183674
(bootloader)	partition[18].last_lba = 1187769
(bootloader)	partition[18].size 2048 KB
(bootloader)	partition[19].name = abootb
(bootloader)	partition[19].first_lba = 1187770
(bootloader)	partition[19].last_lba = 1198009
(bootloader)	partition[19].size 5120 KB
(bootloader)	partition[20].name = rpmb
(bootloader)	partition[20].first_lba = 1198010
(bootloader)	partition[20].last_lba = 1199033
(bootloader)	partition[20].size 512 KB
(bootloader)	partition[21].name = tzb
(bootloader)	partition[21].first_lba = 1199034
(bootloader)	partition[21].last_lba = 1200057
(bootloader)	partition[21].size 512 KB
(bootloader)	partition[22].name = system
(bootloader)	partition[22].first_lba = 1310720
(bootloader)	partition[22].last_lba = 3031039
(bootloader)	partition[22].size 860160 KB
(bootloader)	partition[23].name = cache
(bootloader)	partition[23].first_lba = 3031040
(bootloader)	partition[23].last_lba = 4177919
(bootloader)	partition[23].size 573440 KB
(bootloader)	partition[24].name = misc
(bootloader)	partition[24].first_lba = 4194304
(bootloader)	partition[24].last_lba = 4196351
(bootloader)	partition[24].size 1024 KB
(bootloader)	partition[25].name = recovery
(bootloader)	partition[25].first_lba = 4325376
(bootloader)	partition[25].last_lba = 4345855
(bootloader)	partition[25].size 10240 KB
(bootloader)	partition[26].name = DDR
(bootloader)	partition[26].first_lba = 4456448
(bootloader)	partition[26].last_lba = 4456463
(bootloader)	partition[26].size 8 KB
(bootloader)	partition[27].name = ssd
(bootloader)	partition[27].first_lba = 4456464
(bootloader)	partition[27].last_lba = 4456479
(bootloader)	partition[27].size 8 KB
(bootloader)	partition[28].name = m9kefsc
(bootloader)	partition[28].first_lba = 4456480
(bootloader)	partition[28].last_lba = 4456481
(bootloader)	partition[28].size 1 KB
(bootloader)	partition[29].name = metadata
(bootloader)	partition[29].first_lba = 4587520
(bootloader)	partition[29].last_lba = 4587583
(bootloader)	partition[29].size 32 KB
(bootloader)	partition[30].name = userdata
(bootloader)	partition[30].first_lba = 4718592
(bootloader)	partition[30].last_lba = 60424158
(bootloader)	partition[30].size 27852783 KB
(bootloader)	partition[31].name =
(bootloader)	partition[31].first_lba = 0
(bootloader)	partition[31].last_lba = 0
(bootloader)	partition[31].size 0 KB
(bootloader)	partition[32].name =
(bootloader)	partition[32].first_lba = 0
(bootloader)	partition[32].last_lba = 0
(bootloader)	partition[32].size 0 KB
(bootloader)	partition[33].name =
(bootloader)	partition[33].first_lba = 0
(bootloader)	partition[33].last_lba = 0
(bootloader)	partition[33].size 0 KB
(bootloader)	partition[34].name =
(bootloader)	partition[34].first_lba = 0
(bootloader)	partition[34].last_lba = 0
(bootloader)	partition[34].size 0 KB
(bootloader)	partition[35].name =
(bootloader)	partition[35].first_lba = 0
(bootloader)	partition[35].last_lba = 0
(bootloader)	partition[35].size 0 KB
(bootloader)	partition[36].name =
(bootloader)	partition[36].first_lba = 0
(bootloader)	partition[36].last_lba = 0
(bootloader)	partition[36].size 0 KB
(bootloader)	partition[37].name =
(bootloader)	partition[37].first_lba = 0
(bootloader)	partition[37].last_lba = 0
(bootloader)	partition[37].size 0 KB
OKAY [ 0.150s]
finished. total time: 0.150s
root@TECRA:~#

Tried formating data as you suggested:

Formatting Data using make_ext4fs...
Failed to mount '/data' (Invalid argument)
Failed to mount '/data' (Invalid argument)
Unable to recreate /data/media folder.
You may need to reboot recovery to be able to use /data again.
Updating partition details...
Failed to mount '/system' (Invalid argument)
Failed to mount '/data' (Invalid argument)
...done
Unable to mount storage

Rebooted recovery (as suggested in the log) but still, no luck. It still asked me for my encryption password by the way so I'm assuming that formatting data did not work.