[Nexus 7 (2013) Q&A] markusb68:
Here is the output of 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 [ 1.281s]
finished. total time: 1.315s

"fastboot format cache" dos not complete.

Looks like the eMMC chip is faulty and needs to be replaced.

Can it be done for a reasonable price here in Germany?